Article Figures & Data
Figures
- FIG 1.
Initial CT scan of the mass obtained 15 years before presentation at our institution. The images demonstrate a densely calcified mass in the right posterior fossa (asterisk), without substantial local mass effect.
- FIG 2.
MR imaging at the time of presentation demonstrates a slight interval increase in the size of the mass. Dense intralesional calcifications are again observed, as evidenced by substantial signal drop-out on T2 (A) and susceptibility-weighted (B) images. Axial T1 image (C) shows areas of internal hyperintense signal. FLAIR image (D) shows adjacent vasogenic edema, with a mild associated mass effect on the fourth ventricle. Axial (E) and coronal (F) postcontrast images demonstrate intense peripheral enhancement around the perimeter of the lesion, as well as a possible dural tail (arrow).
- FIG 3.
Histologic examination revealed a tumefactive lesion characterized by exuberant calcification (A, original magnification ×50) around areas of chondromyxoid fibrillary matrix (B, original magnification ×20). Palisading spindle cells and a mild chronic inflammatory infiltrate are present on the periphery (C, original magnification ×200). All specimens are stained with hematoxylin-eosin.
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