YOKOHAMA, Japan - Ginjiro Shigeoka has undergone brain surgery after collapsing in the ring following his loss to Pedro Taduran on Saturday.

Shigeoka was fighting Taduran for the second time, after he lost his IBF flyweight title to him last July. Shigeoka was beaten badly and also collapsed in the ring after their first encounter, but was given the all-clear ahead of the rematch.

The second encounter was less brutal, but again Shigeoka collapsed and was unresponsive in the corner. He was taken out on a stretcher.

Viva Promotions, the handlers of Taduran, have now announced in a recent post that Shigeoka has undergone surgery.

The post read: “According to JBC [Japanese Boxing Commission], Japanese Former IBF Champion Ginjiro Shigeoka has suffered from an acute subdural hematoma and has already undergone a craniotomy.

“G. Shigeoka is still currently under observation in a private hospital in Osaka, Japan. The commission has already enforced that Shigeoka has to retire from boxing following his craniotomy procedure.”

A craniotomy is a surgical procedure that involves the temporary removal of part of the skull to expose the brain for various reasons. They could include treating for brain tumors, blood clots, or repairing skull fractures.