Rapp-Hodgkin syndrome

Rapp-Hodgkin syndrome (also known as Rapp-Hodgkin ectodermal dysplasia syndrome) is a rare genetic disorder belonging to the group of ectodermal dysplasias, conditions that affect the development of structures derived from the ectoderm, including the skin, hair, nails, teeth, and sweat glands. It is now widely considered to be part of the same clinical spectrum as ankyloblepharon-ectodermal defects-cleft lip/palate (AEC) syndrome (also called Hay-Wells syndrome), as both conditions are caused by mutations in the TP63 gene. The syndrome is characterized by a distinctive triad of features: ectodermal dysplasia, cleft lip and/or cleft palate, and anhidrosis or hypohidrosis (reduced or absent sweating). Key clinical features include sparse, wiry, and slow-growing scalp hair, small and dysplastic (malformed) nails, reduced ability to sweat leading to heat intolerance, and dental anomalies such as missing teeth (hypodontia), small teeth (microdontia), or conical-shaped teeth. Cleft palate is common, and cleft lip may also occur. Additional features can include a narrow nose with a depressed nasal bridge, small mouth, and recurrent skin erosions or dermatitis, particularly of the scalp. Some patients may experience chronic skin infections and granulation tissue formation on the scalp. Lacrimal duct abnormalities and mild limb anomalies such as syndactyly have also been reported. There is no cure for Rapp-Hodgkin syndrome, and treatment is supportive and symptom-based. Management typically involves surgical repair of cleft lip and/or palate, dental prosthetics and orthodontic care for dental anomalies, dermatologic care for skin and scalp issues, and measures to prevent overheating in patients with reduced sweating. A multidisciplinary approach involving geneticists, dermatologists, dentists, plastic surgeons, and other specialists is recommended for optimal care.

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