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Aqueductal stenosis

(Science: radiology) most common cause of congenital hydrocephalus (43%), aqueduct develops about the 6th week of gestation, M:F = 2:1, other congenital anomalies (16%): thumb deformities, prognosis: 11-30% mortality aetiology: infectious (50%): toxoplasmosis, cmv, syphillis, mumps, influenza, developmental: forking, narrowing, transverse septum (x-linked recessive), neoplastic (extremely rare): glioma, pinealoma, meningioma