Pachydermoperiostosis mimicking the acral abnormalities of acromegaly

Pachydermoperiostosis Due to a Novel HPGD Splicing Site Mutation Masquerading as Acromegaly

Hypertrophic osteoarthropathy (HOA: MIM 167100)) is classified into primary and secondary types. Primary HOA, also known as pachydermoperiostosis (PDP), is a rare genetic condition with distinct clinical features including digital clubbing, skin thickening, and periostosis. Secondary HOA often occurs as a paraneoplastic syndrome or is associated with systemic diseases. In this report, we present a 17-year-old male patient who initially presented with significant digital clubbing, enlarged hands and feet, and excessive sweating. Although the initial suspected diagnosis was acromegaly, the patient's plasma level of insulin-like growth factor 1 was normal and growth hormone levels suppressed to <1 ng/dL following oral glucose tolerance test. Whole exome sequencing followed by Sanger sequencing of leukocyte deoxyribonucleic acid revealed a novel splicing variant in the 15-hydroxyprostaglandin dehydrogenase (HPGD) gene (NM_000860.6: c.662 + 5_662 + 8del). Reverse transcription polymerase chain reaction confirmed that this variant led to defective splicing with skipping of exon 6, a frameshift, and truncation at codon 13 of exon 7 downstream. His symptoms did not respond well to nonsteroidal anti-inflammatory drugs but showed excellent response to a trial of lanreotide autogel that has been used for about 1 year.

Pseudoacromegaly-A challenging entity in the endocrine clinic: A systematic review

OBJECTIVE

Pseudoacromegaly encompasses conditions with features of acromegaly/gigantism, but no growth hormone (GH) or insulin-like growth factor-1 (IGF-1) excess. We aimed to review published pseudoacromegaly cases evaluated due to clinical suspicion of acromegaly.

DESIGN/PATIENTS

PubMed/Medline search was conducted to identify reported pseudoacromegaly cases, which were systematically reviewed to ensure they met eligibility criteria: (1) presentation suggestive of acromegaly; (2) acromegaly excluded based on normal GH, IGF-1 and/or GH suppression on oral glucose tolerance test (OGTT-GH); (3) diagnosis of the pseudoacromegaly condition was established. Data were retrieved from each case and analysed collectively.

RESULTS

Of 76 cases, 47 were males, mean ages at presentation and at first acromegaloid symptoms were 28 ± 16 and 17 ± 10 years, respectively. Most common conditions were pachydermoperiostosis (47%) and insulin-mediated pseudoacromegaly (IMP) (24%). Acromegaloid facies (75%) and acral enlargement (80%) were the most common features. Measurement of random GH was reported in 65%, IGF-1 in 79%, OGTT-GH in 51%. GH excess was more frequently excluded based on two tests (53%). Magnetic resonance imaging (MRI) was performed in 30 patients, with pituitary adenoma or hyperplasia being reported in eight and three patients, respectively. Investigations differed between cases managed by endocrine and non-endocrine specialists, the former requesting more often IGF-1, OGTT-GH and pituitary MRI.

CONCLUSIONS

Pseudoacromegaly is a challenging entity that may be encountered by endocrinologists. Pachydermoperiostosis and IMP are the conditions most often mimicking acromegaly. Adequate assessment of GH/IGF-1 is crucial to exclude acromegaly, which may be better performed by endocrinologists. Pituitary incidentalomas are common and require careful judgement to prevent unnecessary pituitary surgery.

Primary hypertrophic osteoarthropathy: genetics, clinical features and management

Primary hypertrophic osteoarthropathy (PHO) is a genetic disorder mainly characterized by clubbing fingers, pachydermia and periostosis. Mutations in the HPGD or SLCO2A1 gene lead to impaired prostaglandin E2 (PGE2) degradation, thus elevating PGE2 levels. The identification of the causative genes has provided a better understanding of the underlying mechanisms. PHO can be divided into three subtypes according to its pathogenic gene and inheritance patterns. The onset age, sex ratio and clinical features differ among subtypes. The synthesis and signaling pathways of PGE2 are outlined in this review. Cyclooxygenase-2 (COX-2) is the key enzyme that acts as the rate-limiting step for prostaglandin production, thus COX-2 inhibitors have been used to treat this disease. Although this treatment showed effective results, it has side effects that restrain its use. Here, we reviewed the genetics, clinical features, differential diagnosis and current treatment options of PHO according to our many years of clinical research on the disease. We also discussed probable treatment that may be an option in the future.

Pachydermoperiostosis and Work Restrictions: A Case Report

Pachydermoperiostosis (PDP) is a rare disease that mimics the clinical and radiographical manifestations of acromegaly. Therefore, it should be considered as one of the differential diagnoses in the evaluation of acromegalic patients. In this study, we discussed a case of PDP in a 24-year-old simple worker working in a food industry factory and reviewed the work restrictions caused by the complications of the disease.

Acromegaly-related cutis verticis gyrata

OBJECTIVE

Acromegaly is a disorder caused by hypersecretion of growth hormone (GH), resulting in excessive levels of insulin-like growth factor 1 (IGF-1), and almost always due to a pituitary tumor. It is classically associated with acral enlargement, prominent facial features and soft tissue overgrowth. Skin manifestations include hirsutism, acne, skin tags, oily skin and acanthosis nigricans. However, other uncommon dermatological features, such as cutis verticis gyrata (CVG), may also occur. Here, we review acromegaly-related CVG aiming to raise awareness for its possible occurrence in this setting, and we discuss its pathophysiology, presentation, management and differential diagnosis.

DESIGN

A comprehensive literature search regarding CVG, particularly CVG related to acromegaly, has been carried out. Case reports, original studies and review papers, were considered.

RESULTS

CVG is a rare benign skin lesion characterized by thickened and folded scalp, resembling the brain gyri and sulci. The diagnosis of CVG mainly relies on clinical examination, although tissue biopsy may be necessary in case of uncertain etiology. In acromegaly, CVG appears to be driven by the trophic effects of GH and IGF-1 on skin and soft tissues. While CVG is uncommon in acromegaly, it seems to occur more frequently in male patients. The management of acromegaly-related CVG essentially relies on controlling the serum levels of GH and IGF-1. Surgical skin procedures should be reserved for patients with severe aesthetic distress, after achieving the best possible control of acromegaly.

CONCLUSIONS

CVG is a rare manifestation of acromegaly that may allow an earlier diagnosis and a swifter treatment of these patients, which in turn may improve or entirely reverse such remarkable skin lesions.

Differential Diagnosis of Acromegaly: Pachydermoperiostosis Two New Cases from Turkey

Pachydermoperiostosis (PDP), also known as primary hypertrophic osteoarthropathy, is a rare genetic disorder characterized by pachyderma and periostosis. Acromegaly is a condition caused by excessive secretion of growth hormone (GH) leading to elevated insulin-like growth factor 1 levels, and is characterised by somatic overgrowth and physical disfigurement, notably affecting hands and feet. We present two cases referred with an initial diagnosis of acromegaly that were ultimately diagnosed as PDP. Case 1: A 17 year-old boy presented with enlargement in both feet and hands, finger clubbing, swelling in knee joints, knee pain, coarsening of facial skin lines and forehead skin, and excessive sweating which increased gradually over five years. There were prominent skin folds on the forehead, face, and eyelids. Also, there was an enlargement in both hands and clubbing of the fingers. There was marked swelling in the knee joints and ankles. Genetic analysis revealed a novel homozygous variant NM_005630: c.31C>T (p.Q11*) in the SLCO2A1 gene. Case 2: A 16 year-old boy presented with coarsening of forehead skin and scalp, excessive sweating, and pain in the elbow and knee over three years. Skin folds were prominent on the forehead and scalp. Genetic analysis revealed a homozygous variant NM_005630.2:c.86delG (p.G29Afs*48) in the SLCO2A1 gene. Such clinical presentation contemporaneous with normal GH level and prominent radiological abnormalities prompted the diagnosis of PDP. In conclusion, PDP is a very rare osteoarthrodermopathic disorder with clinical and radiographic presentation that may mimic acromegaly. In the evaluation of patients with acromegaloid appearance, PDP should be considered as a differential diagnosis.

Approach to the Patient With Pseudoacromegaly

Pseudoacromegaly encompasses a heterogeneous group of conditions in which patients have clinical features of acromegaly or gigantism, but no excess of GH or IGF-1. Acromegaloid physical features or accelerated growth in a patient may prompt referral to endocrinologists. Because pseudoacromegaly conditions are rare and heterogeneous, often with overlapping clinical features, the underlying diagnosis may be challenging to establish. As many of these have a genetic origin, such as pachydermoperiostosis, Sotos syndrome, Weaver syndrome, or Cantú syndrome, collaboration is key with clinical geneticists in the diagnosis of these patients. Although rare, awareness of these uncommon conditions and their characteristic features will help their timely recognition.