Micrograph MPNST

(A) Low-power photomicrograph of a retroperitoneal, high-grade malignant peripheral nerve sheath tumor (MPNST). Note the dense cellularity of the neoplasm completely surrounding normal nerve fascicles (arrows). H&E, x40.
(B) The tumor cells are spindle shaped, and mitoses are easily found on high power (arrows). H&E, x400.
(C) MPNSTs can also have an epithelioid appearance, as seen in another retroperitoneal example. H&E, x200.