Tracheal paraganglioma: a diagnostic dilemma culminating in a complex airway management problem

Management dilemmas of tracheal paraganglioma: a case report and review of literature

Paragangliomas of the trachea are rare neoplasms and can present to the clinician with acute airway problems. These neoplasms sometimes are misdiagnosed by general practitioners as asthmatic exacerbation. We present the case of a 66-year-old woman who presented to us with a history of dyspnoea at rest in the supine position and on exertion and a productive cough. This was diagnosed as bronchial asthma and she was treated with corticosteroid inhalers for four months by her GP. She was subsequently evaluated by computed tomography of the neck and thorax, which revealed an intratracheal enhancing lesion measuring around 11 mm in the lower cervical trachea. Fibreoptic bronchoscopy showed a mass lesion at the level of mid trachea. A low tracheostomy was followed by telescopic examination and the mass was resected using coablation. Histology of the mass was reported as paraganglioma. Difficulties encountered and literature review of various management options are presented in this report.

Tracheal Paraganglioma: A Case report and Review of the Pertinent Literature

The trachea is a sporadic origin of paraganglioma. The purpose of the present study was to identify the features of tracheal paraganglioma and reveal the effectiveness of computed tomography (CT) and magnetic resonance imaging (MRI) by reviewing both previous and current cases. In cases of tracheal tumors, we need to consider the bleeding risk associated with a biopsy, as the tumor may be paraganglioma, which is hypervascular. If a biopsy is not available, then CT and MRI can aid in making a pre-operative diagnosis. MRI in particular is useful for long-term observations.

Non-circumferential membranous resection of the trachea for paraganglioma: A case report

INTRODUCTION

Paraganglioma is a rare neuroendocrine tumor and may sometimes be located in the membranous part of the trachea.

PRESENTATION OF CASE

We report the case of a 52-year-old man presenting a paraganglioma just above the carina with obstructive symptoms. The patient successfully underwent a non-circumferential tracheal membranous resection, followed by latissimus dorsi muscle flap repair, under peripheral extra-corporeal membrane oxygenation (ECMO).

DISCUSSION

Complex carinal resection can be avoided for tracheal membranous tumors and replaced with non-circumferential resection and direct reconstruction with a muscle flap. In addition, ECMO support may be used for airway resection and reconstruction.

CONCLUSION

Tracheal membranous tumors can be managed without circumferential resection or direct anastomosis.

Tracheal paraganglioma presenting as stridor in a pediatric patient, case report and literature review

OBJECTIVE

To review tracheal paragangliomas and describe the clinical presentation, radiologic findings, operative management, and histologic findings of a pediatric patient who presented with stridor refractory to traditional asthma therapy.

METHODS

Chart review of an 8-year-old male who presented to a tertiary care pediatric hospital and literature review of tracheal paragangliomas.

RESULTS

We present the case of an 8-year-old male who presented with new-onset of wheezing and dyspnea on exertion. He was given a new diagnosis of asthma and treated with bronchodilators that failed to improve his symptoms, which progressed over 3 months until he presented urgently with biphasic stridor. Bedside flexible laryngoscopy failed to reveal an etiology. Computed tomography (CT) imaging demonstrated 17 × 12 × 16 mm exophytic mass arising from the posterior membranous trachea with extension of the mass to the border of the thyroid gland and separate from the esophagus. Magnetic resonance imaging (MRI) angiography confirmed vascular supply from the right thyrocervical trunk and inferior thyroid artery. Rigid microlaryngoscopy revealed a friable vascular polypoid mass 2 cm distal to the vocal folds with 75% obstruction of the airway from which a small biopsy was taken. Pathology confirmed paraganglioma with neuroendocrine cells arranged in "zellballen" architecture and strong immunopositivity for chromogranin and synaptophysin in the neuroendocrine cells and S100 immunopositivity in the sustentacular cells. The patient underwent complete open resection of the tumor including three tracheal rings with primary anastomosis. Final pathology confirmed paraganglioma and negative margins. Genetic screening revealed a succinate dehydrogenase complex subunit C (SDHC) germline mutation, confirming hereditary paraganglioma/pheochromocytoma syndrome. He remains well at 3 month follow up without dyspnea or stridor.

CONCLUSION

Tracheal paragangliomas are exceptionally rare, with 12 reported cases. This is the only pediatric case reported. In pediatric patients with persistent airway complaints, subglottic and tracheal masses and obstruction should be considered. Due to the vascularity and endotracheal component of tracheal paragangliomas, a detailed surgical plan should consider embolization, endotracheal laser photocoagulation and electrocautery, and open surgical resection. Additionally, pediatric patients benefit from a multidisciplinary approach including radiology, endocrinology, and genetic counseling.

Paragangliomas: update on differential diagnostic considerations, composite tumors, and recent genetic developments

Recent developments in molecular genetics have expanded the spectrum of disorders associated with pheochromocytomas (PCCs) and extra-adrenal paragangliomas (PGLs) and have increased the roles of pathologists in helping to guide patient care. At least 30% of these tumors are now known to be hereditary, and germline mutations of at least 10 genes are known to cause the tumors to develop. Genotype-phenotype correlations have been identified, including differences in tumor distribution, catecholamine production, and risk of metastasis, and types of tumors not previously associated with PCC/PGL are now considered in the spectrum of hereditary disease. Important new findings are that mutations of succinate dehydrogenase genes SDHA, SDHB, SDHC, SDHD, and SDHAF2 (collectively "SDHx") are responsible for a large percentage of hereditary PCC/PGL and that SDHB mutations are strongly correlated with extra-adrenal tumor location, metastasis, and poor prognosis. Further, gastrointestinal stromal tumors and renal tumors are now associated with SDHx mutations. A PCC or PGL caused by any of the hereditary susceptibility genes can present as a solitary, apparently sporadic, tumor, and substantial numbers of patients presenting with apparently sporadic tumors harbor occult germline mutations of susceptibility genes. Current roles of pathologists are differential diagnosis of primary tumors and metastases, identification of clues to occult hereditary disease, and triaging of patients for optimal genetic testing by immunohistochemical staining of tumor tissue for the loss of SDHB and SDHA protein. Diagnostic pitfalls are posed by morphological variants of PCC/PGL, unusual anatomic sites of occurrence, and coexisting neuroendocrine tumors of other types in some hereditary syndromes. These pitfalls can be avoided by judicious use of appropriate immunohistochemical stains. Aside from loss of staining for SDHB, criteria for predicting risk of metastasis are still controversial, and "malignancy" is diagnosed only after metastases have occurred. All PCCs/PGLs are considered to pose some risk of metastasis, and long-term follow-up is advised.