A pheochromocytoma that metastasizes to other anatomic sites. Common sites of metastasis include lymph nodes, bones, liver, and lung. Morphologic features associated with malignant pheochromocytomas include: atypical mitotic figures, capsular and vascular invasion, tumor cell necrosis, and high mitotic activity. The disease is MONDO_0006288 (malignant adrenal gland pheochromocytoma). Also known as: adrenal gland pheochromocytoma, malignant, malignant adrenal gland Chromaffinoma, malignant adrenal gland chromaffin neoplasm, malignant adrenal gland chromaffin paraganglioma, malignant adrenal gland chromaffin tumor, malignant adrenal gland chromaffin tumour, malignant adrenal gland paraganglioma, malignant adrenal medullary paraganglioma.