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The variable morphology of FH-deficient PCC/PGL. A, Prominent vascular spaces. B. Typical nested and trabecular growth pattern with sustentacular cells. The cytoplasm is abundant and varies from amphophilic (C) to palely eosinophilic (D). E, Most cases were circumscribed and encapsulated, with a clear demarcation from the normal adrenal gland. F, Irregular extension of tumor cells into adjacent soft tissue was seen in a minority of cases.
