title: Intramuscular myxoid lipoma in the proximal forearm presenting as an olecranon mass with superficial radial nerve palsy: a case report.
abstract: BACKGROUND
  Extremity lipomas may occur in any location, including the proximal forearm. We describe a case of a patient with an intramuscular lipoma presenting as an unusual posterior elbow mass.
  
  
  METHODS
  We discuss the case of a 57-year-old Caucasian man who presented with a tender, posterior elbow mass initially diagnosed as chronic olecranon bursitis. A minor sensory disturbance in the distribution of the superficial radial nerve was initially thought to be unrelated, but was likely caused by mass effect from the lipoma. No pre-operative advanced imaging was obtained because the diagnosis was felt to have already been made. At the time of surgery, a fatty mass originating in the volar forearm muscles was found to have breached the dorsal forearm fascia and displaced the olecranon bursa. Tissue diagnosis was made by histopathology as a myxoid lipoma with no aggressive features. Post-operative recovery was uneventful.
  
  
  CONCLUSIONS
  We present a case of an unusual elbow mass presenting with symptoms consistent with chronic olecranon bursitis, a relatively common condition. The only unexplained pre-operative finding was the non-specific finding of a transient superficial radial nerve deficit. We remind clinicians to be cautious when diagnosing soft tissue masses in the extremities when unexplained physical findings are present.
authors.affiliation: Division of Orthopedic Surgery, Department of Surgery, University of Calgary, NW Calgary, Alberta T2N 4Z6, Canada. hildebrk@ucalgary.ca.
authors.forename: Peter
authors.initials: P
authors.lastname: Lewkonia
authors.forename: Shaun Ac
authors.initials: SA
authors.lastname: Medlicott
authors.forename: Kevin A
authors.initials: KA
authors.lastname: Hildebrand