Softball injury causing haemoperitoneum due to ruptured Meckel's mesodiverticular band.

A 16-year-old male sustained an intra-abdominal haemorrhage after diving for last base during a softball game. At laparotomy a ruptured patent mesodiverticular band supplying a large Meckel's diverticulum was found. Traumatic rupture of a mesodiverticular band leading to massive intra-abdominal haemorrhage is a rare event, and has never been reported as a single injury or in the context of a sport's injury.