title: Endolymphatic sac tumor located around semicircular canals.
abstract: We report a case of endolymphatic sac tumor (ELST). A 48-year-old female had recurrent and slowly progressive hearing loss, accompanied with dizziness like Meniere's disease. A tumor was located around the semicircular canals, and was detected on CT and MRI. The patient underwent total removal of the tumor using a transmastoid approach. Histopathological examinations agreed with features of an ELST. The tumor was highly suspected to have originated from the rugose portion of the endolymphatic sac or the endolymphatic duct, based on surgical and imaging studies. Structure of the membranous labyrinth was preserved regardless of the existence of the tumor around semicircular canals with bone destruction. ELSTs seem to have an osteolytic or osteophilic nature, by examining patterns of tumor infiltration.
authors.affiliation: Department of Otolaryngology, Niigata University, Graduate School of Medical and Dental Science, Japan. wadatadashi@hotmail.com
authors.forename: Tadashi
authors.initials: T
authors.lastname: Wada
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Fujisaki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Satoh
authors.forename: Sugata
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D004428:Ear Neoplasms / Q000150:complications / Q000473:pathology* / Q000601:surgery; D004711:Endolymphatic Duct / Q000473:pathology / Q000601:surgery; D004712:Endolymphatic Sac / Q000473:pathology* / Q000601:surgery; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000209:etiology / Q000601:surgery; D006801:Humans; D008416:Mastoid / Q000473:pathology; D008575:Meniere Disease / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000473:pathology; D012665:Semicircular Canals / Q000473:pathology* / Q000601:surgery; D012720:Severity of Illness Index