How did my brother-in-law died?

My 25 years old brother-in-law had a road accident in, which he lost his left limb with abrasive injuries on face and other parts of body. He was admitted in hospital and was declared clinically dead after 2 days. The doctors told us that the fat from broken bones had reached the brain and the cause of death given was polytrauma and cerebral oedema. Is that possible.

 

Bones contain fat in the marrow and when broken this fat can be released into the blood and block small arteries. This is called the fat embolism syndrome and is a recognised complication of severe injury. Poly trauma means injuries to many parts of the body. Cerebral oedema refers to swelling of the brain after it has been injured and is a common cause of death in those with severe injury to the head.