title: An analysis of clinical features of pulmonary giant hydatid cyst in adult population.
abstract: BACKGROUND
  We performed an analysis of giant hydatid cysts (GCHs) detected in the adult population by comparison with the features of other simple hydatid cysts (CHs) in the light of the relevant literature.
  
  
  METHODS
  The records of 74 adult patients who were operated on in our clinic for pulmonary CHs between 2001 and 2005 were retrospectively evaluated. Cysts that were 10 cm or larger in diameter on any plane were considered GCHs. The cysts were classified into 2 groups as GCHs (group A) and other (group B). The groups were then compared for age, sex, symptom, cyst location, preoperative complications, surgical procedure performed, operative morbidity, and mortality.
  
  
  RESULTS
  Of 74 patients, 10 (13.5%) were in group A and 64 were in group B. No differences were detected between the clinical presentation, gender distribution, surgical procedure performed, and postoperative morbidity and mortality rates of GCHs and other cysts in adults. In both groups, there were no significant differences between the rates of involvement of 2 lungs (P = .527). However, both groups had lower lobe involvement, more markedly in group A (81.8% and 45.5% respectively; P = .023). Two patients in group A (20%) and 18 patients in group B (28.1%) had complicated cysts.
  
  
  CONCLUSIONS
  The tendency of GCH to involve the lower lobe of the lung compared to smaller cysts suggests underlying mechanisms other than lung elasticity in the late onset of the symptoms parallel to cyst growth.
authors.affiliation: Numune Teaching and Research Hospital, Division of Thoracic Surgery, Ankara, Turkey.
authors.forename: Bulent
authors.initials: B
authors.lastname: Kocer
authors.forename: Gultekin
authors.initials: G
authors.lastname: Gulbahar
authors.forename: Serdar
authors.initials: S
authors.lastname: Han
authors.forename: Elif
authors.initials: E
authors.lastname: Durukan
authors.forename: Koray
authors.initials: K
authors.lastname: Dural
authors.forename: Unal
authors.initials: U
authors.lastname: Sakinci
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004445:Echinococcosis, Pulmonary / Q000175:diagnosis* / Q000453:epidemiology / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult