title: Epithelioid sarcoma of the parotid gland of a child.
abstract: Epithelioid sarcoma is a rare soft-tissue tumor that usually occurs in young adults, with a median age of 26 years. This malignancy has been divided into distal and proximal types. The latter is found in proximal body sites including the head and neck region. We present a rare case of parotid proximal-type epithelioid sarcoma in a 1-year-old male child; this is the 4th reported case in the literature and the youngest in a pediatric patient to date. The tumor showed prominent rhabdoid features by light microscopy. Immunohistochemical studies revealed positive staining to cytokeratin (AE1/AE3), epithelial membrane antigen, vimentin, and BAF47. Thus, while the tumor resembled a malignant rhabdoid tumor, the positive staining for BAF47 supported instead a diagnosis of epithelioid sarcoma, according to our current understanding of these 2 tumor types. Also, the clinical course was not the typical aggressive behavior of a rhabdoid tumor. The patient underwent radical parotidectomy without adjuvant therapy and remained disease-free at follow-up, 14 months after surgery.
authors.affiliation: Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand. trcskl@md2.md.chula.ac.th
authors.forename: Somboon
authors.initials: S
authors.lastname: Keelawat
authors.forename: Shanop
authors.initials: S
authors.lastname: Shuangshoti
authors.forename: Wipawee
authors.initials: W
authors.lastname: Kittikowit
authors.forename: Sukalaya
authors.initials: S
authors.lastname: Lerdlum
authors.forename: Paul S
authors.initials: PS
authors.lastname: Thorner