Ankyloblepharon filiforme adnatum-imperforate anus syndrome

Ankyloblepharon filiforme adnatum-imperforate anus syndrome (also known as AFA-imperforate anus syndrome) is an extremely rare congenital condition characterized by the combination of two primary birth defects: ankyloblepharon filiforme adnatum (AFA) and imperforate anus. Ankyloblepharon filiforme adnatum refers to the presence of thin strands of tissue (filiform bands) connecting the upper and lower eyelids, partially restricting eye opening. Imperforate anus (anal atresia) is a malformation in which the anal opening is absent or abnormally closed, preventing normal passage of stool. These features are present at birth and affect the ocular and gastrointestinal systems. The eyelid fusion bands in AFA are typically thin and can often be divided simply by surgical lysis or may even rupture spontaneously. The imperforate anus requires surgical correction, usually in the neonatal period, to establish a functional anal canal and allow normal bowel function. Additional anomalies may occasionally be associated, though the hallmark features remain the eyelid bands and anorectal malformation. The syndrome has been reported in only a handful of cases in the medical literature, making it one of the rarest congenital malformation associations. Early surgical intervention for both the eyelid and anorectal components generally leads to favorable outcomes, though long-term follow-up may be needed for bowel function management. Genetic counseling is recommended for affected families, although the precise genetic basis remains incompletely characterized.

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