Brain Abscess.

2. Subdural hematoma: turned out to be pus, abscess. Assisted by me.
  pus is capuslated with much thicker membrane than hematoma.
  Barr hole first.
  found it was abscess. small craniotomy. and drained.

  Subdural hematoma is much more common!
  2, 3 cases / 180 days (6 mo) for epidural hematoma
  180 cases / 180 days.