A stroke is not a form of traumatic brain injury. A stroke is a form of acquired brain injury. A very simplified explanation is that the word "traumatic" in TBI refers to the causation of the brain injury. TBI's are caused by external forces. Strokes are not caused by external forces. Strokes are caused by issues in the brain. Therefore, strokes are a form of ABI, but they are not a form of TBI. Ask your medical authority for an explanation.