Recurrent Omental Hemangiopericytoma: A Therapeutic Challenge

Figure 1

(a) Microscopic description: the tumor is cellular and composed of many variable ectatic and compressed thin walled branching vessels, giving staghorn configuration. The surrounding tumor cells are spindled to round with scant pale to eosinophilic cytoplasm, bland vesicular nuclei, and low mitotic activity. (b) Immunohistochemically, the tumor cells stain positive for CD34. The combined morphology and immunoprofile are consistent with hemangiopericytoma.

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