title: Infected primary paraspinal hydatidosis with water lily sign.
abstract: BACKGROUND
  Primary muscular hydatidosis is extremely rare, and the diagnosis of the infected muscular hydatid cyst can be difficult due to atypical clinical and radiological findings.
  
  
  METHODS
  We present herein an interesting case of a 24-year-old man with primary infected muscular hydatid cyst located in the paraspinal muscles eroding the right lamina of C6 vertebra that was diagnosed with water lily sign on computed tomography.
  
  
  CONCLUSIONS
  Water lily sign is a pathognomonic imaging finding for hydatidosis, and defined when free-floating endocyst is seen. Cyst hydatid should always be considered in the differential diagnosis of any soft tissue mass of the patients from endemic regions.
authors.affiliation: Department of Radiology, Harran University School of Medicine, Sanliurfa, Turkey.
authors.forename: Sema
authors.initials: S
authors.lastname: Yildiz
authors.forename: Emin
authors.initials: E
authors.lastname: Komur
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Akti
authors.forename: Hamza
authors.initials: H
authors.lastname: Karabag
mesh_terms: D000328:Adult; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging*; D004443:Echinococcosis / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D009135:Muscular Diseases / Q000000981:diagnostic imaging*; D009334:Neck Muscles / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D055815:Young Adult