How can bone marrow get into the bloodstream and why is it dangerous?

Fat embolism is a complication that occurs from long bone fractures (usually the femur). The marrow fat escapes the bone and enters the blood stream traveling to the lungs and brain and causes acute respiratory failure, altered mental status, skin changes, low platelets. There is no specific treatment just management of the symptoms and the diagnosis is made clinically, there are no specific tests for it.