Anonychia-microcephaly syndrome

Anonychia-microcephaly syndrome is an extremely rare genetic disorder characterized by the combination of anonychia (complete absence of fingernails and toenails) and microcephaly (an abnormally small head circumference, reflecting reduced brain size). This condition is present from birth, with the nail abnormalities and small head size being apparent in the neonatal period. The syndrome primarily affects the integumentary system (nails) and the central nervous system (brain development). Affected individuals may also exhibit intellectual disability of variable severity associated with the microcephaly. The condition has been reported in very few families in the medical literature, making it one of the rarest described genetic syndromes. The original reports described affected siblings born to consanguineous parents, supporting an autosomal recessive pattern of inheritance. The underlying molecular genetic cause has not been definitively established. There is currently no specific or curative treatment for anonychia-microcephaly syndrome. Management is supportive and symptomatic, focusing on developmental support and educational interventions for individuals with intellectual disability. Monitoring of growth parameters, neurological development, and appropriate referrals to specialists such as neurologists and developmental pediatricians are recommended. Genetic counseling is advised for affected families to discuss recurrence risks and family planning options.

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