Abstract
Spindle cell rhabdomyosarcoma is a rare variant of embryonal rhabdomyosarcoma. Most commonly involves the paratesticular region followed by head and neck. A 3-year-old male patient presented with a chief complaint of fever and ear infection. Clinical examination revealed a swelling in right region of parotid gland. On CT scan was observed an invasive mass in deep topography of right parotid, with extensive lysis in mandibular area. The fine needle aspiration cytology revealed grouping of elongated cells with prominent nucleoli, which are distributed in fasciculate arrangements conclusive for neoplastic cells. An incisional biopsy was performed and the histopathologic examination revealed a proliferation of elongated and vesicular cells, arranged in fascicles, showing atypical mitosis. The diagnosis was neoplasia with uncertain histogenesis. The case presented immunopositivity for desmin, CD 34 and miogen. The definitive diagnosis was spindle cell rhabdomyosarcoma. The patient was under cycles of chemotherapy and currently is being monitored.
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