Spindle cell sarcoma - pelvis
Right hip pain and immobility
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There is a 5.5 x 11 x 21 cm extensive large infiltrative soft tissue mass involving the gluteus maximus, medius, minimus and adductor group muscles.
The right sciatic nerve also show abnormal intrasubstance increased signal and caliber due to nerve involvement.
This is a pathologically-proven case of low-grade spindle cell sarcoma.
Sections show neoplastic tissue composed of a diffuse proliferation of spindle cells with eosinophilic cytoplasm, prominent nucleoli, minimal atypia and rare mitotic figures (1-2/10 HPF) growing in long sweeping fascicles and infiltrating the skeletal muscle.