[Rhabdomyosarcoma in childhood. I. Histologic structure].

Histological structure of rhabdomyosarcoma was studied in a group of 37 children. The classification was: embryonal rhabdomyosarcoma in 28 cases, alveolar rhabdomyosarcoma in 9 cases. 5 cases showed an ambivalent structure. The diagnosis of rhabdomyosarcoma is based on cytology: various rhabdomyoblasts are to be identified as well as distinguished from similar cells. The structural point of view is helpful but diagnostic only in typical cases of sarcoma botryoides and alveolar rhabdomyosarcoma. Undifferentiated cells maturating into rhabdomyoblasts combined with numerous polymorphic cells were found consecutive investigations of individual cases.