A patient breaking wind during a surgical procedure sparked a fire that caused her to be seriously burnt, according to Japanese mediainfo-icon reports.

The fire occurred at Tokyo Medical University Hospital in Shinjuku Ward on 15 April, reported the Asiainfo-icon News Network.

The patient, in her 30s, was undergoing an operation that involved applying a laser to her cervix, the lower part of the uterus.

The laser was reportedly ignited by the gas she passed and she suffered burns to her waist and legs, said a report by a committee of external experts who examined the case.It found no fault with the equipment used in the surgery.

"When the patient's intestinal gas leaked into the spaceinfo-icon of the operation [room], it ignited with the irradiation of the laser, and the burning spread, eventually reaching the surgical drape and causing the fire," the report said