title: Snapping hip caused by a venous hemangioma of the gluteus maximus muscle: a case report.
abstract: BACKGROUND
  Snapping hip, or coxa saltans, is defined as a clinical condition where a usually painful, audible snap occurs during hip flexion and extension. Its causes can be divided into external, internal or intra-articular origin. Accurate diagnosis is a prerequisite to successful treatment. We report a rare cause of snapping hip which is different from any previously reported cases.
  
  
  METHODS
  A 23-year-old man presented to us with right hip pain of more than 10 years duration. Atrophy of the right gluteus maximus with snapping and tenderness were also noted. The imaging study revealed a focal intramuscular lesion in the lateral portion of the right gluteus maximus muscle. Surgery was performed and pathological examination concluded this mass to be a venous hemangioma.
  
  
  CONCLUSIONS
  Intramuscular hemangioma, though rare, should be considered in the differential diagnosis of a snapping hip even though muscle fibrosis is most frequently encountered.
authors.affiliation: Department of Orthopedics, National Cheng Kung University Medical Center, Tainan, Taiwan. lin.chengli@xuite.net
authors.forename: Cheng-Li
authors.initials: CL
authors.lastname: Lin
authors.forename: Ming-Tung
authors.initials: MT
authors.lastname: Huang
authors.forename: Chii-Jeng
authors.initials: CJ
authors.lastname: Lin