Cx31.1 can selectively intermix with co-expressed connexins to facilitate its assembly into gap junctions

Connexins are channel-forming proteins that function to facilitate gap junctional intercellular communication. Here, we use dual cell voltage clamp and dye transfer studies to corroborate past findings showing that Cx31.1 (encoded by GJB5) is defective in gap junction channel formation, illustrating that Cx31.1 alone does not form functional gap junction channels in connexin-deficient mammalian cells. Rather Cx31.1 transiently localizes to the secretory pathway with a subpopulation reaching the cell surface, which is rarely seen in puncta reminiscent of gap junctions. Intracellular retained Cx31.1 was subject to degradation as Cx31.1 accumulated in the presence of proteasomal inhibition, had a faster turnover when Cx43 was present and ultimately reached lysosomes. Although intracellularly retained Cx31.1 was found to interact with Cx43, this interaction did not rescue its delivery to the cell surface. Conversely, the co-expression of Cx31 dramatically rescued the assembly of Cx31.1 into gap junctions where gap junction-mediated dye transfer was enhanced. Collectively, our results indicate that the localization and functional status of Cx31.1 is altered through selective interplay with co-expressed connexins, perhaps suggesting Cx31.1 is a key regulator of intercellular signaling in keratinocytes.

Spatial and Temporal Localization of Connexins in Cells Using Confocal Microscopy

The 21-member connexin family found in humans is the building block of both single-membrane spanning channels (hemichannels) and double-membrane spanning intercellular channels. These large-pore channels are dynamic and typically have a short life span of only a few hours. Imaging connexins from the time of synthesis in the endoplasmic reticulum through to their degradation can be challenging given their distinct assembly states and transient residences in many subcellular compartments. Here, we describe how connexins can be effectively imaged on a confocal microscope in living cells when tagged with fluorescent proteins and when immunolabeled with high affinity anti-connexin antibodies in fixed cells. Temporal and spatial localization of multiple connexins and disease-linked connexin mutants at the subcellular level extensively informs on the mechanisms governing connexin regulation in health and disease.

Diversity in connexin biology

Over 35 years ago the cell biology community was introduced to connexins as the subunit employed to assemble semicrystalline clusters of intercellular channels that had been well described morphologically as gap junctions. The decade that followed would see knowledge of the unexpectedly large 21-member human connexin family grow to reflect unique and overlapping expression patterns in all organ systems. While connexin biology initially focused on their role in constructing highly regulated intercellular channels, this was destined to change as discoveries revealed that connexin hemichannels at the cell surface had novel roles in many cell types, especially when considering connexin pathologies. Acceptance of connexins as having bifunctional channel properties was initially met with some resistance, which has given way in recent years to the premise that connexins have multifunctional properties. Depending on the connexin isoform and cell of origin, connexins have wide-ranging half-lives that vary from a couple of hours to the life expectancy of the cell. Diversity in connexin channel characteristics and molecular properties were further revealed by X-ray crystallography and single-particle cryo-EM. New avenues have seen connexins or connexin fragments playing roles in cell adhesion, tunneling nanotubes, extracellular vesicles, mitochondrial membranes, transcription regulation, and in other emerging cellular functions. These discoveries were largely linked to Cx43, which is prominent in most human organs. Here, we will review the evolution of knowledge on connexin expression in human adults and more recent evidence linking connexins to a highly diverse array of cellular functions.

GJB4 variants linked to skin disease exhibit a trafficking deficiency en route to gap junction formation that can be restored by co-expression of select connexins

Epidermal keratinocytes are enriched with at least nine connexins that are key regulators of epidermal homeostasis. The role of Cx30.3 in keratinocytes and epidermal health became evident when fourteen autosomal dominant mutations in the Cx30.3-encoding GJB4 gene were linked to a rare and incurable skin disorder called erythrokeratodermia variabilis et progressiva (EKVP). While these variants are linked to EKVP, they remain largely uncharacterized hindering therapeutic options. In this study, we characterize the expression and functional status of three EKVP-linked Cx30.3 mutants (G12D, T85P, and F189Y) in tissue-relevant and differentiation-competent rat epidermal keratinocytes. We found that GFP-tagged Cx30.3 mutants were non-functional likely due to their impaired trafficking and primary entrapment within the endoplasmic reticulum (ER). However, all mutants failed to increase BiP/GRP78 levels suggesting they were not inducing an unfolded protein response. FLAG-tagged Cx30.3 mutants were also trafficking impaired yet occasionally exhibited some capacity to assemble into gap junctions. The pathological impact of these mutants may extend beyond their trafficking deficiencies as keratinocytes expressing FLAG-tagged Cx30.3 mutants exhibited increased propidium iodide uptake in the absence of divalent cations. Attempts to rescue the delivery of trafficking impaired GFP-tagged Cx30.3 mutants into gap junctions by chemical chaperone treatment were ineffective. However, co-expression of wild type Cx30.3 greatly enhanced the assembly of Cx30.3 mutants into gap junctions, although endogenous levels of Cx30.3 do not appear to prevent the skin pathology found in patients harboring these autosomal dominant mutations. In addition, a spectrum of connexin isoforms (Cx26, Cx30, and Cx43) exhibited the differential ability to trans-dominantly rescue the assembly of GFP-tagged Cx30.3 mutants into gap junctions suggesting a broad range of connexins found in keratinocytes may favourably interact with Cx30.3 mutants. We conclude that selective upregulation of compatible wild type connexins in keratinocytes may have potential therapeutic value in rescuing epidermal defects invoked by Cx30.3 EKVP-linked mutants.

Caustic soda ingestion -- a case presentation and review of the literature

We present a case report of a 2-year-old child with a hypopharyngeal stricture secondary to caustic soda ingestion. We discuss the initial and long-term management of caustic soda ingestion. In this case the hypopharynx was successfully reconstructed using a pedicled pectoralis major flap. We demonstrate the versatility of this flap, which is traditionally known for its use in adult head and neck surgery.

Disordered breathing during sleep in patients with mucopolysaccharidoses

OBJECTIVE

Obstructive sleep apnoea (OSA) has been reported as a feature of children with mucopolysaccharidoses (MPS). However, the incidence and severity of OSA with respect to disease type is poorly defined. The aim of the present study was to measure objectively the degree of OSA in a group of children with a range of MPS syndromes.

METHODS

In a cross-sectional study, cardiopulmonary sleep studies were performed during unsedated sleep in 26 children with MPS over a period of 2 years. Scores of OSA severity based upon clinical history and upon objective sleep study data were made in each case and compared.

RESULTS

OSA was present in 24/26 patients, and ranged in severity from mild to severe. OSA was most marked in MPS type IH (Hurler syndrome) followed by types IHS (Hurler--Scheie syndrome) and II (Hunter syndrome). Frequent arousals and poor sleep quality, not suspected clinically, were noted in several patients. There was agreement between the clinical and objective scoring systems in only 17/26 patients (65%) with clinical history scores tending to underestimate the most severe cases (5/26 cases) and overestimate the severity in the mild cases (4/26 cases).

CONCLUSIONS

Obstructive respiratory problems are frequent in MPS patients and there are differences in severity of OSA between the different MPS types. Assessments of the severity of OSA based upon clinical history alone are inadequate. Our results suggest that objective sleep studies are necessary to evaluate these cases, to monitor clinical outcome and to assess the effects of therapeutic intervention. Prospective studies in larger numbers of patients are needed to validate these observations.

Maxillary myxoma: a rare midfacial mass in a child

The case of a maxillary myxoma in a 13-month-old child is presented. This case highlights the difficulties associated with managing such cases. The tumour was found at operation to be unencapsulated and infiltrative. This was contrary to the preoperative CT scan findings and necessitated a change from a sublabial to a lateral rhinotomy approach. This case illustrates a potential pitfall of CT scanning in such cases: it is likely that a MRI scan would have demonstrated the invasive nature of this tumour. To the authors' knowledge this is the second youngest reported case of maxillary myxoma in the literature.

Management and outcome of choanal atresia correction

OBJECTIVES

Outcome analyses of factors that may either maximize success or predict a better outcome following choanal atresia correction.

METHODS

A retrospective review of children undergoing choanal atresia correction at Great Ormond Street Hospital for Children, London between January 1990 and April 1998. Children with unilateral or bilateral choanal atresia were studied. In all cases, correction was by a transnasal approach under endoscopic control. A 120 degrees Hopkins rod telescope was used to visualize the atretic plate from the nasopharynx. Straight urethral sounds were used to perforate the plate followed by use of an air drill to remove the bony component. Portex endotracheal tubes were subsequently inserted as nasal stents.

RESULTS

Sixty-five children (19 M, 46 F: age range 1 day to 17 years) presented with choanal atresia and the outcomes for 46 were included in the study. Twenty-six patients (40%) had other major anomalies. In children with unilateral atresia neither duration of stenting nor presence of facial anomalies had an impact on outcome. Of those children with bilateral choanal atresia and associated facial anomalies (n=9), 56% were asymptomatic following correction. In children with isolated bilateral choanal atresia (n=19), 74% were asymptomatic following correction; 29% (n2.3 kg (n3. 5 mm (n=6) had an 83% chance of a good outcome. Those patients stented with a tube </=3.5 mm (n=22) had only a 64% success rate. None of the patients who were stented for at least 12 weeks remained symptomatic.

CONCLUSIONS

Neonates with bilateral choanal atresia who were stented for at least 12 weeks with the largest Portex tube that comfortably passed through the anterior nares had the best outcome. If they had either associated anomalies or low weight at surgery, they were less likely to become asymptomatic. For patients with unilateral choanal atresia, neither the presence of facial anomalies nor stent duration had an impact on outcome.

Cimetidine treatment for recurrent respiratory papillomatosis

Effective adjuvant treatment for recurrent respiratory papillomatosis (RRP) is at present limited to alpha-interferon, which may have significant side effects including rebound growth of papillomata following its withdrawal, is given by injection and is expensive. High dose cimetidine is known to have immunomodulatory side effects and has been reported as a useful treatment for cutaneous warts. We report a case of very advanced RRP with tracheo-bronchial-pulmonary involvement treated with adjuvant cimetidine at a dose of 40 mg/kg for 4 months. The patient enjoyed a remarkable improvement in her clinical condition following treatment. The literature regarding cimetidine treatment for cutaneous warts is reviewed.

Diagnostic value of infantile stridor: a perceptual test

INTRODUCTION

stridor is the most common presenting symptom of pediatric airway obstruction, yet its value in clinical diagnosis is undetermined. The purpose of this study was to determine what diagnostic information was available to clinicians based entirely on listening to infantile stridor.

METHOD

ten taped samples of stridor and corresponding clinical summaries were independently scored by Pediatric Otolaryngologists and their trainees. Respondents were asked to score the 'perceived' severity of the stridor based on their aural perception. Participants were recruited by an advertisement on the Internet Pediatric Otolaryngology forum. Thirty-eight consultants and 22 trainees responded. The responses were compared to known outcomes in the ten patients presented.

RESULTS

listening to stridor in isolation resulted in respondents performing at the level of chance when their score of 'perceived' severity was compared to the known clinical outcome. When the clinical summaries (of the same patients) were scored, the level of performance significantly improved (P < 0.001). There was no difference in the level of performance when responses of trainees were compared with consultants, although there was a trend towards improved performance by the consultants.

CONCLUSION

the importance of infantile stridor judged in isolation is of limited diagnostic value. Clinical information contributes significantly to the rating of stridor severity. The combination of both clinical and auditory information will likely improve diagnostic acumen.

Otologic and laryngologic manifestations of mucopolysaccharidoses after bone marrow transplantation

INTRODUCTION

Children with mucopolysaccharidosis have significant functional impairment of a number of systems because of deposition of glycosaminoglycans. The otolaryngologic system is affected, resulting in conductive and sensorineural hearing loss and voice abnormality.

METHOD

Eleven children who had undergone bone marrow transplantation had their hearing and voices assessed. Unmatched data from patients who had not undergone transplantation were collected for nonstatistical comparison.

RESULTS

The hearing loss in children who had undergone bone marrow transplantation was variable but on average was less severe than in the younger children who had not undergone transplantation. The incidence of otitis media with effusion was diminished in the transplanted group. Approximately half had normal voices.

DISCUSSION

Diminution of the progression of hearing loss and voice abnormality probably occurs in patients after treatment by bone marrow transplantation.

Auditory brainstem responses after radiotherapy for nasopharyngeal carcinoma

The effect of irradiation for nasopharyngeal carcinoma on auditory brainstem responses and hearing was investigated in 19 otologically normal patients undergoing standard fractionated megavoltage radiotherapy. Auditory brainstem responses and pure tone audiometry were performed before radiotherapy, and at 3 and 12 months after completion of radiotherapy. There were no significant changes in the wave I-III and III-V interpeak intervals, or in sensorineural hearing thresholds (bone conduction at 4 kHz and average of bone conduction at 0.5, 1, 2 and 4 kHz), after radiotherapy. In contrast to previous studies, we found no evoked potential evidence of subclinical brainstem damage arising from irradiation for nasopharyngeal carcinoma.

The developing role of a paediatric voice clinic: a review of our experience

OBJECTIVE

We report our experience in developing a paediatric voice clinic within a tertiary otolaryngology department and describe the emerging role of this specialized clinic.

MATERIALS

Currently our referral base is divided between other otolaryngologists within our department who require voice assessment as part of the pre- or post-operative management of laryngeal disorders (e.g. cysts, webs, vocal fold palsies, laryngo-tracheal reconstruction) and other professionals within our hospital who require characterisation of voice within the broader task of defining medical conditions in which voice abnormalities exist (e.g. mucopolysaccharidoses, functional dysphonias).

METHODS

The patients were assessed by a team consisting of a paediatric laryngologist and a speech and language therapist. Each patient underwent a perceptual voice assessment and qualitative voice assessment using electrolaryngography. Direct visualisation was attempted and methods of and suitability for, such examination are discussed.

RESULTS

Our experience is reviewed and guidelines for the establishment of a paediatric voice clinic are presented.

Prevalence and prognostic significance of tumor-associated tissue eosinophilia in nasopharyngeal carcinoma

BACKGROUND

Tumor-associated tissue eosinophilia (TATE) has been associated with an improved prognosis in a variety of neoplasms.

METHODS

Diagnostic biopsy specimens from 96 patients with nasopharyngeal carcinoma (NPC) were reviewed for the presence of TATE by an observer blinded to the patients' clinical histories. Comparisons between patients with and without TATE with respect to the probabilities of local recurrence, distant metastasis, and survival were performed using the log rank test on Kaplan-Meier product-limit estimates and the Cox proportional hazards model.

RESULTS

The prevalence of TATE in these patients was 32%, and was not significantly associated with local recurrence, distant metastasis, or survival.

CONCLUSIONS

These results are discordant with those of studies in other tumor models, although comparison is hampered by varying definitions of TATE. The differing results may be due to variations in the degree of activation of the eosinophils present in TATE in different tumors.

Adult croup

Adult croup is a distinct disease entity that probably represents a heterogeneous clinical syndrome. Three cases of adult laryngotracheitis characterized by upper airway infection and progression to airway obstruction are illustrated. Close observation and prompt decisions regarding airway intervention are critical in effective management, and complete resolution is expected.

Prevalence and prognostic significance of tumor-associated tissue eosinophilia in nasopharyngeal carcinoma

BACKGROUND

Tumor-associated tissue eosinophilia (TATE) has been associated with an improved prognosis in a variety of neoplasms.

METHODS

Diagnostic biopsy specimens from 96 patients with nasopharyngeal carcinoma (NPC) were reviewed for the presence of TATE by an observer blinded to the patients' clinical histories. Comparisons between patients with and without TATE with respect to the probabilities of local recurrence, distant metastasis, and survival were performed using the log rank test on Kaplan-Meier product-limit estimates and the Cox proportional hazards model.

RESULTS

The prevalence of TATE in these patients was 32%, and was not significantly associated with local recurrence, distant metastasis, or survival.

CONCLUSIONS

These results are discordant with those of studies in other tumor models, although comparison is hampered by varying definitions of TATE. The differing results may be due to variations in the degree of activation of the eosinophils present in TATE in different tumors.

Swallowing in motor neurone disease

Ninety-two patients with motor neurone disease have been assessed clinically and radiologically for evidence of swallowing problems. At the time of examination, moderate or severe swallowing difficulty was present in 89% of those whose disease had presented as bulbar palsy, in 45% of those in whom the disease began many months before as progressive muscular atrophy and in 29% of those with amyotrophic lateral sclerosis. Patients with more severe swallowing symptoms appeared more likely to have abnormal findings on videofluoroscopy overall. However, not all patients with an abnormal radiological picture had swallowing difficulties. It is suggested that radiological signs should only be used within the context of clinical symptoms and signs in the selection of patients for palliative surgery. Thirteen patients with pseudobulbar symptoms and signs had a cricopharyngeal myotomy performed: two suffered major post-operative complications. However, the satisfaction rate was 89% and we recommend cricopharyngeal myotomy for such patients. Pharyngostomy was performed for seven patients unable to initiate swallowing, six had post-operative complications.

MRI as a single screening procedure for acoustic neuroma: a cost effective protocol

Magnetic resonance imaging (MRI) is accepted as the 'gold standard' in diagnosing acoustic neuromas. Limited availability and perceived high costs have prevented clinicians from using it as a first-line investigation. A prospective study was set up in a specially designated screening session to audit the cost effectiveness and accuracy of audiovestibular investigations compared to MRI. Ninety-nine patients with asymmetrical audiovestibular symptoms or signs were investigated. Of these 54 evoked response audiometry tests, and 39 calorics were either not performed or were inconclusive. One patient refused to enter the MRI machine. All others received an unequivocal report after MRI and four tumours (three intracanalicular) were detected. The total cost of the audiovestibular protocol was 12,545 pounds compared to 12,900 pounds for the MRI protocol, which is a diagnostic and well-tolerated procedure. This study shows that MRI can be cost effective, as well as accurate, when used as a single screening procedure for acoustic neuromas.

Benign thyroid disease and vocal cord palsy

The case notes of 2453 consecutive patients admitted for thyroid surgery and with successful preoperative laryngoscopy were examined retrospectively. Of the 2408 patients who had not had previous operations on the gland, 2321 proved to have benign pathology. A total of 29 patients had a preoperative vocal cord palsy of which 22 were associated with benign disease. Return of cord movement after surgery occurred in 89% of the patients with a benign goitre. We advocate routine preoperative laryngoscopy to detect vocal cord paresis. Such a finding with a goitre does not necessarily indicate malignancy. The recurrent laryngeal nerve should therefore be identified at surgery and preserved to allow for recovery of vocal cord movement.

Day case adenoidectomy

The Audit Commission recommends that more day surgery be undertaken in the Health Service. In a prospective study of 62 children undergoing adenoidectomy one major complication commenced within 2 hours of surgery. Of 15 minor complications, 78% occurred within 6 hours of surgery; they did not herald later major complications. Day adenoidectomy can safely be performed if patients remain in hospital for 6-8 hours post-operatively and then fulfil the following discharge criteria: they are apyrexial, eating, drinking and with no signs of haemorrhage. This will not result in a significant increase in workload for general practitioners. Day adenoidectomy for medically and socially appropriate patients increases our day surgery figures by 74% to 43% of the routine paediatric ENT caseload. There are immediate benefits to patients but the potential economic benefits to the Health Service will not be felt unless these children are treated in a designated Day Case Unit.

The role of CT imaging in the management of chronic suppurative otitis media

CT imaging of the temporal bone is highly predictive of the presence of cholesteatoma but its value in the routine management of cholesteatoma has not been assessed. We aimed to establish the indications for CT imaging in CSOM by a prospective study of patients suspected of having cholesteatoma. The patients were assessed clinically and a management plan chosen; this was later adjusted, if indicated, on the basis of radiological findings. Surgical findings were recorded and correlation with CT appearances evaluated. Twenty patients completed the study. CT altered the management plan in 10 and was considered helpful in a further 6. We recommend its routine use in children, medically unfit patients, only or better hearing ears, patients in whom the tympanic membrane cannot be adequately visualized, patients who have had previous mastoid surgery whose operative records are available and patients with intratemporal or intracranial complications of disease.

The value of head dressings for middle ear surgery

A prospective trial was performed to ascertain the value of head dressings in the post-operative management of patients undergoing middle ear and mastoid surgery. One hundred consecutive patients were randomly allocated to a head dressing or no head dressing group after wound closure. Nine patients in the head dressing group developed a wound complication as opposed to four patients in the no head dressing group. The application of a pressure dressing following middle ear and mastoid surgery is unnecessary and may contribute to increased wound morbidity.

Diffuse tuberculous parotitis

Parenchymatous parotid tuberculosis diffusely affecting the entire gland is very rare. We present a case, associated with a primary pulmonary focus, that was confirmed after positive identification of alcohol and acid-fast bacilli in gastric washings. Both sites of infection resolved with quadruple anti-tuberculous chemotherapy.

Pseudomonal supraglottitis occurring in a patient with profound neutropenia secondary to virus-associated haemophagocytic syndrome

We present a case of virus-associated haemophagocytic syndrome following Epstein-Barr virus infection in which a fulminant pseudomonal supraglottitis developed. Increasingly, unusual pathogens have been found in immunocompromised patients. This is the first reported case of pseudomonal supraglottitis.

CSF drainage in patients with posterior fossa tumours

The management of hydrocephalus secondary to a posterior fossa tumour is controversial. We audited recent practice with a retrospective analysis of 287 consecutive patients undergoing posterior fossa exploration for tumour. 85 shunts and 112 external ventricular drains (EVD) were placed. The overall CNS infection rate in the series was 6%. There was a significantly higher (p less than 0.01) infection rate in patients who had a drainage procedure, and a trend towards higher infection rates in patients with two drainage procedures. Early infection rates with EVDs and shunts were the same (7%). One third of patients with hydrocephalus had pre-operative drainage, a third had per-operative drainage but only a quarter required a permanent shunt. The majority of patients will not require a permanent shunt and where temporary CSF diversion is required EVD is reasonable.

Styloid apparatus anomaly causing dysphagia

An unusual case of dysphagia due to anomalous styloid apparatus anatomy is presented. Clinical and radiological findings are documented. Variations in anatomy and clinical syndromes are discussed together with management.

Audit of stapedectomy results in a teaching hospital

The number of stapedectomies performed annually has declined since 1963. Also, surgery has become available at an increasing number of centres, resulting in a further fall in the number of such operations performed in teaching hospitals. Several studies have suggested benefit might be gained, both by patients and by otology as a speciality, from limiting training to post-graduates who show an aptitude for otology, and concentrating surgery in a small number of specialized centres. We report a series of 179 patients who had stapedectomy performed for otosclerosis in a teaching hospital. We have retrospectively compared the audiological outcome and complication rates for consultants and surgical trainees. For the two groups, there is no significant difference in postoperative hearing levels and complication rates are similar. Our success rate is comparable to other major series. We conclude that stapedectomy is a safe procedure to teach adequately experienced and supervised trainees.

Metastatic meningioma in the neck

Although meningiomas represent 15 per cent of tumours of the central nervous system, they rarely metastasize. A case is presented in which metastasis to a cervical lymph node occurred, together with local recurrence, nine years after initial diagnosis and treatment. This case serves to illustrate that malignant meningioma is a rare cause of a neck mass.

Long-term results of submandibular duct transposition for drooling

This study examines the long-term results and morbidity of submandibular duct transposition in drooling children. Twenty-two patients, aged 3 to 18 years, with neurological dysfunction and excessive drooling underwent submandibular duct transposition between 1984 and 1987. In January 1990, 20 patients were reviewed. Their degree of drooling pre-operatively, immediately post-operatively and currently was assessed. The rate of improvement and the occurrence of complications were noted. Drooling was 'much better' in the early post-operative period in 17 of the 20 patients, and this improvement was invariably noted within three weeks. In the three other patients drooling was 'better'. Deterioration occurred in only three patients over the entire follow-up period. Complications all occurred in the first 18 months following surgery; they consisted of salivary retention cysts in four and transient submandibular gland swelling in a fifth patient.

Angiosarcoma of the external ear: a case report

A case of an angiosarcoma of the pinna in an 82-year-old male is reported. Variability of presentation and lack of clinical awareness may result in a delay in the diagnosis of this rare tumor. Initial confusion may arise because of the deceptively benign clinical appearance of the lesion, which may resemble a bruise or superficial infection. Early biopsy is mandatory in view of the prognostic significance of tumor diameter at the time of diagnosis. Untreated, the mean survival of patients with angiosarcoma is 7 months. This increases to 15 to 20 months in treated patients, 12 percent being alive at 5 years. A combination of surgery and radiotherapy offers the best chance of cure. The need for wide local treatment of apparently normal tissue has been advocated because of imperceptible local spread of the tumor. Apparent cure may be followed by late local recurrence or distant metastasis, so lifelong follow-up is necessary.

Is routine histological examination of nasal polyps justified?

This study aims to assess the indications for histological examination of polypoid lesions removed from the nose. To achieve this we have performed a national survey of consultant ENT surgeons and reviewed 2866 nasal polypectomy operations. The operations were performed between 1982 and 1988 in the Radcliffe Infirmary, Oxford and the Freeman Hospital, Newcastle. One hundred and fifty questionnaires were sent to randomly selected ENT consultants in the United Kingdom. One hundred and seventeen were returned completed (return rate 78%). The questionnaire asked whether or not the surgeon sent all polyps for examination and, if not, what his indications were for so doing. A retrospective review of all nasal polypectomy operations at the two hospitals was performed. The questionnaire revealed that 38% of the surgeons who replied sent all nasal polyps for examination and 62% did not. The commonest indications for requesting histology were unilateral polyps, abnormal appearance and a history of bleeding. The review of polypectomies showed that 74% of cases in Oxford were examined histologically and 33% in Newcastle. Two per cent of polyps were tumours, of which half were malignant. There were no cases in this study in which unsuspected malignancy was found. All cases of nasal tumours, benign or malignant, were diagnosed clinically either in the Outpatient clinic or in the operating theatre. The results of this survey suggest that it is unnecessary to send all nasal polyps for histological examination.