Embryonal Rhabdomyosarcoma : Introduction
Embryonal rhabdomyosarcoma (RMS) makes up 60% of all RMS. Most cases involve children below 10 years of age (mean age 7 years). It is less common in adolescents and young adults and is rare in adults. The most frequent site of involvement is head and neck region (orbit, parameninges) followed by the genitourinary tract. The image shows densely packed hypercellular area on the right composed of small undifferentiated cells adjacent to a less cellular myxoid area on the left.