title: An endolymphatic sac tumor with imaging features of aneurysmal bone cysts: differential diagnostic considerations.
abstract: BACKGROUND
  Endolymphatic sac tumors (ELSTs) are rare, slow-growing tumors of the petrous bone. Despite the typical localisation, their radiological diagnosis can be challenging due to the variety of other tumors potentially showing similar features.
  
  
  METHODS
  We present a 16-year-old child with progressive hearing loss, vertigo, and tinnitus who had a large petrous bone lesion showing imaging features of both ELSTs and aneurysmal bone cysts (ABCs). The patient underwent preoperative embolization of the tumor-supplying vessels and subsequently a subtotal resection. Histological examination revealed an ELST.
  
  
  CONCLUSIONS
  Despite the rarity of petrous bone ABCs, they should be considered as a differential diagnostic alternative of ELSTs due to their similar imaging appearance.
authors.affiliation: Department of Neuroradiology, Universitätsklinikum Würzburg, Josef-Schneider-Strasse 11, 97080, Würzburg, Germany, Alkonyi_B@ukw.de.
authors.forename: Bálint
authors.initials: B
authors.lastname: Alkonyi
authors.forename: Thomas
authors.initials: T
authors.lastname: Günthner-Lengsfeld
authors.forename: Kristen
authors.initials: K
authors.lastname: Rak
authors.forename: Johannes
authors.initials: J
authors.lastname: Nowak
authors.forename: László
authors.initials: L
authors.lastname: Solymosi
authors.forename: Rudolf
authors.initials: R
authors.lastname: Hagen
mesh_terms: D000293:Adolescent; D017824:Bone Cysts, Aneurysmal / Q000150:complications / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004428:Ear Neoplasms / Q000150:complications / Q000175:diagnosis*; D004712:Endolymphatic Sac / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male