perivascular hemosiderin
Iron pigment deposits around blood vessels indicating previous microhemorrhages or vascular injury.
Full Definition
Perivascular hemosiderin refers to iron-containing pigment deposits that accumulate around cerebral blood vessels following microhemorrhages or chronic vascular injury. These golden-brown deposits represent breakdown products of hemoglobin and can be visualized with routine histological stains or confirmed with iron stains such as Prussian blue. Perivascular hemosiderin is commonly observed in conditions involving chronic hypertensive changes, cerebral amyloid angiopathy, and traumatic brain injury. The distribution and extent of hemosiderin deposition can provide important clues about the underlying vascular pathology and the chronicity of bleeding events.
Usage
Usage note: Indicates previous bleeding; confirm with iron stains when in doubt.
In Context
- "Perivascular hemosiderin deposits were noted throughout the subcortical white matter, suggesting chronic microbleeds." — Vascular dementia case
- "Prussian blue staining confirmed the presence of perivascular hemosiderin in the affected regions." — Special stains report