How do a concussion and a contusion differ?

Concussion Contusion: A contusion is an injury to the brain that causes a bruise (bleeding) which will usually be identifiable on ct scan. A concussion will usually have no bleeding on the scan, although damage, whether reversible or not, occurs.

Contusion: specific: Contusion is a specific term that denotes that there is a hemorrhage or bruise in the brain tissue as a result of the injury. This may be seen on ct and MRI scans. Concussion refers to the traumatic brain injury where there may or may not be a loss of consciousness. Sequelae include headache, nausea/vomiting, inability to concentrate or think. A person may have both a concussion and a contusion.