[Late diagnosis bilateral congenital diaphragmatic hernia: a case report]. Hernia diafragmática congénita bilateral de diagnóstico tardío: reporte de un caso. Congenital diaphragmatic hernia (CDH) is a rare malformation, usually unilateral and left sided. Bilateral CDH (B-CDH) represents 1% of all CDH. Mortality is higher in right side and bilateral defects. We report a case of a patient with Bilateral CDH, initially diagnosed and treated as unilateral right CDH. At 8 months during a laparoscopic Ladd procedure a left side CDH was found.