A case of a newborn Kiso native pony diagnosed with a median hard cleft palate and urachal hypoplasia

A male foal developing within a pregnant native Hokkaido mare presented with an abnormal bladder on gestational day 215 and was delivered by inducing parturition. Transabdominal ultrasonography indicated a bladder depth of >13 cm, with a wall-like structure bisecting the bladder. At 42 hr after birth, transnasal endoscopy revealed a cleft hard palate, and the foal was subsequently euthanized. A defect in the palatine process of the maxillary head and a large cyst connected to the bladder, although not continuous with the umbilicus, were identified by autopsy computed tomography and necropsy. The foal was accordingly diagnosed with a cleft median hard palate and urachal dysplasia.