A rapid estimation of intracranial haematoma volume on CT. Applies to epidural (EDH), subdural (SDH), and intracerebral (ICH) haematomas. Volume = (A × B × C) ÷ 2, where A = largest diameter, B = diameter perpendicular to A, C = cranio-caudal extent, all measured in cm.
Clinical note – surgical evacuation thresholds: Per the Brain Trauma Foundation (BTF) surgical-management guidelines, an epidural haematoma (EDH) greater than 30 cm³ should be evacuated regardless of GCS, and an acute subdural haematoma (ASDH) should be evacuated if its thickness exceeds 10 mm or the midline shift exceeds 5 mm. These remain guideline thresholds, to be integrated with the full clinical picture and the patient's neurological status.