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WHO Classification of Tumours
Rhabdomyoma, NOS
Connective, subcutaneous and other soft tissues


Rhabdomyoma (RM) is a benign neoplasm arising from striated muscle. It is composed of cytologically bland, delicate fetal myotubules in a myxoid stroma. There may be an admixture of rhabdomyoblasts.

Extracardiac RM is subclassified into adult rhabdomyoma and fetal rhabdomyoma , according to the degree of differentiation, and predominantly affects the head and neck region. Rare cases of extracardiac RM arise in the genital tract (genital rhabdomyoma )

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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