This document discusses common findings on CT brain scans related to various head injuries, including extradural hematoma (EDH), subdural hematoma (SDH), subarachnoid hemorrhage (SAH), intracerebral hemorrhage (ICH), and brain contusions. It provides details on the visual appearance and timing of injuries, such as EDH appearing lens shaped in the acute phase, SDH potentially associated with bridging veins tears, and chronic SDH displaying septations.

1. Monroe-Kellie Doctrine

2. How to Read CT Brain

3. Common CT Brain

4. EDH: lens shape,
MMA injury, lucid
interval, coup
Acute: < 1 day
Subacute: 1-3
days
Chronic:
hypodense with
septation
SDH:
tear
bridging v.,
contrecoup
tSAH: peripheral,
serentine
aSAH: maximal thickness
at basal cistern
Contusion: fluffy appearance,
ill-defined border
ICH: homogenous, well-
defined border