A review of the Service of Neurosurgery of the San Juan de Dios Hospital -National University- in Bogota, for the period 1959-1972 was made. Five cases of Dandy- Walker malformation in adults were found: the clinical and paraclinical findings, and the treatment and results are analyzed. Attention is called over congenital nature with late manifestation in four cases; this etiology was demonstrated in three cases, the other one was associated with a probable chronic meningitis. Only one of the cases was classified as acquired. The surgical therapeutic and the results are discussed.