title: [Primary hydatid cyst of the parotid gland].
abstract: BACKGROUND
  The hydatid cyst is an anthropozoonosis due to the development of the Echinococcus granulosus tapeworm larva in humans. Its intraparotid localization is extremely rare.
  
  
  METHODS
  A 10-year-old-male patient was admitted for an isolated renitent swelling of the left parotid region having grown for several months. Cervical ultrasonography revealed a left parotid cystic mass, characterized by a double wall, and a small daughter cyst. The CT-scan typically showed the absence of enhancement after iodine contrast medium injection. The imaging-based diagnosis of a hydatid cyst was supported by positive hydatid serology, and confirmed by histological analysis of the cyst. No other hydatid location was found (chest and abdominal).
  
  
  CONCLUSIONS
  In spite of its rarity, hydatid cyst can be a diagnosis in case of parotid cystic masses. Ultrasonography is the first examination to be performed; it must be completed by CT-scan or even better by MRI. Once the diagnosis of hydatid cyst is confirmed, a chest radiograph and an abdominal ultrasonography should be performed, to screen for other localizations. Surgical resection is the gold standard treatment.
authors.affiliation: Service de neuroradiologie, hôpital des spécialités, CHU Ibn Sina, université Mohamed V, Souissi, Rabat, Morocco.
authors.forename: B
authors.initials: B
authors.lastname: Zouita
authors.forename: N
authors.initials: N
authors.lastname: Ech-Cherif El Kettani
authors.forename: K
authors.initials: K
authors.lastname: El Jouali
authors.forename: N
authors.initials: N
authors.lastname: Chakir
authors.forename: M R
authors.initials: MR
authors.lastname: El Hassani
authors.forename: M
authors.initials: M
authors.lastname: Jiddane
mesh_terms: D000818:Animals; D002648:Child; D003287:Contrast Media; D004443:Echinococcosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D048209:Echinococcus granulosus / Q000502:physiology; D006801:Humans; D008297:Male; D010305:Parotid Diseases / Q000000981:diagnostic imaging / Q000469:parasitology*; D014057:Tomography, X-Ray Computed / Q000379:methods; D014463:Ultrasonography
chemical_list: D003287:Contrast Media