Extraskeletal Ewing's Sarcoma of parapharyngeal space

Abstract 

Extraskeletal Ewing's Sarcoma (EES) of head and neck region, is a rare soft tissue tumour morphologically similar to the commoner Ewing's Sarcoma arising from bone. We report a case of EES in parapharyngeal space in a 6-year-old male; who presented with stridor. CT scan of neck showed soft tissue mass in right parapharyngeal space with intraorbital and intracranial extention. Histopathological examination showed round cell tumour and immunohistochemistry was positive for CD99 and Vimentin. The patient responded very well to Concurrent Chemoradiation. An extensive review of English literature, to the best of our knowledge, did not reveal any previous case of EES in parapharyngeal space in children; although one similar case in a 53-year male is reported.

Keywords: EES, Parapharyngeal space, Child, Immunohistochemistry