Diagnosis: Acute Intracerebral Hematoma

Acute intracerebral hematoma within the right temporal lobe (arrow) with surrounding edma (E). CT density 68 HU.

60 year-old patient with melanoma. Hemorrhage is from metastatic tumor bleed. Acute hematoma is seen by non-contrast imaging as an area of high density, with density numbers ranging from 40 to 90 HU. CT can detect acute intracerebral blood as small as 2mm, due to contrast between high density of blood and low density of surrounding brain (arrows).