- Subdural hematomas can happen in the elderly because of brain atrophy, and can manifest with neurological deficit.
- Subdural hematomas are caused by rupture of the bridging veins of the brain. This can be caused by trauma, brain atrophy, or possibly by anticoagulant use. They are crescent-shaped on head CT.
- Epidural hematomas, in contrast, are caused by rupture of meningeal arteries secondary to trauma. They are usually lens-shaped on head CT.
- Subdurals are difficult to pick up on head CT because they may be isodense to brain tissue.
References: Management of Recurrent Subdural Hematomas Desai, Virendra R. et al. Neurosurgery Clinics , Volume 28 , Issue 2 , 279 – 286