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WHO Classification of Tumours
Myopericytoma
Connective, subcutaneous and other soft tissues


Definition

Myopericytoma is a benign, usually slow-growing, subcutaneous neoplasm arising most commonly in the distal extremities. The tumours are typically well circumscribed, unencapsulated nodules measuring <2 cm in diameter. They are histologically characterized by oval to spindle shaped myoid appearing cells arranged in a concentric perivascular growth pattern. Subendothelial tumour cell proliferation is frequently observed.
Myopericytoma most commonly affects middle-aged adults but can arise at any age. Complete surgical excision is usually curative; very rare malignant cases of myopericytomas have been reported

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Fletcher CDM, Unni KK, Mertens F (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of Soft Tissue and Bone.
3rd Edition
IARC Press: Lyon 2002



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