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WHO Classification of Tumours
Spindle cell rhabdomyosarcoma
Connective, subcutaneous and other soft tissues


Definition

A morphologic variant of embryonal rhabdomyosarcoma , characterized by the presence of whorls of spindle cells forming a storiform pattern. In children it usually arises from soft tissues of the scrotum or head and neck; in adults it arises in non-paratesticular regions.