Case report. The iron rim sign.
A chronic cystic cerebral hematoma occurred in the frontal lobe and mimicked both clinically and radiographically a frontal sinus mucocele. A rim seen on multidirectional tomography and unenhanced computed tomography was presumed to be composed to calcium. However, electron microscopic analysis revealed the rim to be composed almost entirely of iron from hemosiderin breakdown products. This is the first such report of an "iron rim" that we could find in the literature.
D000328:Adult; D001927:Brain Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D002543:Cerebral Hemorrhage / Q000000981:diagnostic imaging* / Q000473:pathology; D002908:Chronic Disease; D003560:Cysts / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D005626:Frontal Sinus / Q000000981:diagnostic imaging; D006406:Hematoma / Q000000981:diagnostic imaging* / Q000473:pathology; D006485:Hemosiderin; D006801:Humans; D008297:Male; D009078:Mucocele / Q000000981:diagnostic imaging; D010254:Paranasal Sinus Diseases / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed
D006485:Hemosiderin