rhabdomyosarcoma pleomorphic rhabdomyosarcoma MEDGEN:137770 Orphanet:293199 DOID:3250 ONCOTREE:PLRMS UMLS:C0334480 pleomorphic rhabdomyosarcoma NCIT:C4258 GARD:0021165 An aggressive malignant mesenchymal neoplasm with skeletal muscle differentiation, occurring in adults and rarely in children. The tumor is characterized by the presence of bizarre round, spindle, and polygonal cells. Clinical presentation includes a rapidly enlarging painful mass usually of the lower extremities. ICD9:171.9 SCTID:404054005 MONDO:0017386