10/13/2026
You're looking at a CT head and the hematoma has both bright and dark areas inside it. Which one makes you pick up the phone?
Chris Reilly, MD () from ResusX:ReUnion:
🔵 Hyperdense (bright) = organized clot, proteinaceous material; expected, stable
🔴 Isodense/dark within that clot = fresh blood, acute hemorrhage mixing into the hematoma; that's an expanding bleed until proven otherwise.
When you see dark within bright on a non-contrast CT that's not a wait-and-watch finding. That's a neurosurgery call. That's a repeat imaging conversation. That's a patient whose exam you're checking every 15 minutes. Hematoma expansion is one of the strongest predictors of neurological deterioration and mortality in intracranial hemorrhage. The imaging is telling you something; the question is whether you catch it in time. What's your threshold for calling neurosurg when you see this pattern? Comment to discuss.👇