Archives of the AFIP -- RadioGraphics 1995; 15: 893-917

Figure Legend | Panel A | Panel B | Panel C

Figure 20: Malignant soft-tissue hemangiopericytoma in a 54-year-old man with an enlarging mass in the upper arm and liver metastases. Panel A Contrast-enhanced CT scan shows an enhancing mass (arrowheads) in the soft tissue of the upper arm medially. (B and C) Coronal T1-weighted Panel B and axial proton-density weighted Panel C MR images also reveal the mass (large arrows). Both images show prominent, serpentine vascular channels (arrowheads in B; small arrows in C) that remain of low signal intensity on the long repetition time MR image as a result of rapid blood flow. Vascular channels are predominantly seen peripherally, and there is no fat overgrowth, findings that are typical for hemangiopericytoma. The diagnosis was proved histologically (not shown).

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