High power view of ganglion-like cells in proliferative myositis. Treatment is by simple excision. Like proliferative fasciitis, proliferative myositis is likely to be confused with malignant lesions such as embryonal rhabdomyosarcoma or ganglioneuroblastoma, especially in the pediatric age group. Immunostains for myoglobin, desmin and myogenin are usually negative in the ganglion-like cells. And the lesions lack the fibrillary background of neuroblastoma.