Alveolar Rhabdomyosarcoma of the Limb in a Sheep

Abstract

Tumor mass was detected in the skeletal musculature of the tibia in a sheep slaughtered at abattoir. Histologically, the tumor cells were in a typical alveolar pattern, and showed a cartilaginous tissue differentiation in some areas of the tumor mass. This tumor examined by avidin-biotin-peroxidase method was found to be positive for myoglobin. The diagnosis of undifferentiated alveolar rhabdomyosarcoma was based on the results of histopathology and immunohistochemistry.