Hallermann-Streiff syndrome

Hallermann-Streiff syndrome (HSS), also known as Hallermann-Streiff-François syndrome, oculomandibulodyscephaly, or dyscephalia mandibulo-oculofacialis, is a rare congenital disorder characterized by a distinctive combination of craniofacial, ocular, dental, and dermatologic abnormalities. The hallmark features include a bird-like facial appearance (dyscephaly) with a small, underdeveloped lower jaw (mandibular hypoplasia) and beaked nose, bilateral congenital cataracts (often present at birth), proportionate short stature, dental anomalies (including natal teeth, supernumerary teeth, and hypodontia), and hypotrichosis (sparse hair), particularly of the scalp, eyebrows, and eyelashes. Skin atrophy, especially over the nose and scalp, is also commonly observed. The syndrome affects multiple body systems. Craniofacial features include brachycephaly with frontal and parietal bossing, a thin and pointed nose, and a small mouth. Ocular involvement beyond cataracts may include microphthalmia (abnormally small eyes) and other eye anomalies. The mandibular hypoplasia can lead to significant airway management challenges, including obstructive sleep apnea and difficulties with intubation during anesthesia. Intellectual development is typically normal in the majority of patients, though some individuals may have mild intellectual disability. There is no cure for Hallermann-Streiff syndrome, and treatment is symptomatic and supportive. Management typically involves a multidisciplinary approach including ophthalmologic care for cataracts (surgical removal may be necessary), dental management, monitoring and treatment of airway obstruction, and orthopedic follow-up for skeletal issues. Early cataract surgery is important to prevent amblyopia. Genetic counseling is recommended for affected families. Fewer than 200 cases have been reported in the medical literature. The underlying genetic cause remains largely unknown, though most cases appear to occur sporadically.

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