Pleomorphic rhabdomyosarcoma of the calf


Based on the imaging findings, suggesting an aggressive dual lesion, the patient underwent excision histology. There is histological confirmation of a high-grade pleomorphic rhabdomyosarcoma. Pleomorphic rhabdomyosarcoma is the least common type of rhabdomyosarcoma and accounts for only 5% of all rhabdomyosarcomas.

Based on the histological appearance, a spindle cell subtype is considered.

The anatomical site in this patient fits the incidence of these lesions mainly within the limbs and especially the thigh.

The patient's surgical margins were inadequate on initial excision and further surgical debridement was needed. On history, her follow-up has been unremarkable.

The radiological diagnosis offered was a likely malignant peripheral nerve sheath tumor especially of the superficial peroneal nerve in view of the lesions' anatomical location. Excision histology confirmed otherwise.