Hereditary mucoepithelial dysplasia

Hereditary mucoepithelial dysplasia (HMD) is an extremely rare autosomal dominant disorder characterized by abnormal development of mucous membranes and epithelial tissues throughout the body. The condition affects multiple organ systems, primarily involving the oral mucosa, eyes, skin, lungs, and urogenital tract. Key clinical features include chronic oral mucosal inflammation with fiery red, non-keratinized mucosa, recurrent respiratory infections, chronic lung disease, corneal abnormalities (such as pannus formation and cataracts), perineal skin abnormalities, and nonscarring alopecia. The nasal mucosa is also frequently affected, leading to chronic nasal congestion and recurrent sinusitis. Histologically, the condition is characterized by a failure of normal epithelial differentiation, with gap junction abnormalities observed in affected tissues. The disease typically manifests in early childhood, with mucosal changes often apparent from infancy. Affected individuals may experience progressive visual impairment due to corneal vascularization and opacification. Pulmonary involvement can lead to significant morbidity, including recurrent pneumonia and progressive lung disease. Some patients may also develop esophageal and bladder mucosal abnormalities. There is currently no curative treatment for hereditary mucoepithelial dysplasia. Management is supportive and symptom-directed, including treatment of respiratory infections, ophthalmologic care for corneal complications, and dental and oral hygiene management. Given the rarity of the condition, only a small number of families have been reported in the medical literature, and research into the underlying molecular mechanisms remains limited.

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