title: Primary localization of a hydatid cyst in the latissimus dorsi muscle: an unusual location.
abstract: BACKGROUND
  Hydatid disease is a parasitic infection that is endemic in Iran. It infests humans and herbivorous animals and reflects infection by Echinococcus granulosus. Although it can develop anywhere in the body, the liver and lungs are the most common sites of involvement. Primary muscular hydatidosis with no involvement of thoracoabdominal organs is a rare event.
  
  
  METHODS
  Case report and review of relevant literature.
  
  
  RESULTS
  We treated a 27-year old male patient with a swelling on his right shoulder that turned out to be a hydatid cyst by magnetic resonance imaging scan. The treatment included surgical excision combined with post-operative anthelminthic administration. Of the total reported cases of hydatidosis, 0.7-3% were described as musculoskeletal cysts.
  
  
  CONCLUSIONS
  Especially in endemic areas, to avoid fine-needle biopsy and the risk of spillage of cyst contents irrespective of their location, hydatid disease should be considered in the differential diagnosis of muscular masses, and the diagnosis should be made by imaging and serology insofar as possible.
authors: Surgical Oncology Research Center, Imam Reza Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
authors: Mohammad Reza
authors: MR
authors: Motie
authors: Alireza
authors: A
authors: Rezapanah
authors: Masoud
authors: M
authors: Pezeshki Rad
authors: Hossein
authors: H
authors: Razavian
authors: Ali
authors: A
authors: Azadmand
authors: Mahtab
authors: M
authors: Khajeh
mesh_terms: D000328:Adult; D000818:Animals; D000871:Anthelmintics / Q000008:administration & dosage; D004443:Echinococcosis / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D048209:Echinococcus granulosus / Q000302:isolation & purification*; D006801:Humans; D007492:Iran; D008297:Male; D009132:Muscles / Q000473:pathology*; D011859:Radiography; D012782:Shoulder / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery
chemical_list: D000871:Anthelmintics