title: Ultrasound-guided aspiration and injection of an intraneural ganglion cyst of the common peroneal nerve.
abstract: BACKGROUND
  Intraneural ganglion cysts are rare, benign, mucinous lesions that occur within neural sheaths and are thought to involve cystic fluid exiting from nearby synovial joints. They often present as tender masses causing paresthesias in the distribution of the involved nerve, muscle weakness or cramping, or localized or referred pain.
  
  
  METHODS
  We present a case of a patient who initially presented with foot drop due to an intraneural ganglion cyst of the common peroneal nerve. This cyst was successfully treated using ultrasound guidance to aspirate the cyst and inject corticosteroid to prevent further inflammation.
  
  
  METHODS
  Standard of care has previously involved surgical resection, but this has been associated with a high frequency of recurrence. Due to the risks of nerve and vessel damage, there have been efforts to find alternative ways of resolving these cysts.
  
  
  CONCLUSIONS
  Aspiration and injection of corticosteroid is a useful and minimally invasive alternative to surgery for managing intraneural ganglion cysts.
authors.affiliation: Faculty of Medicine, University of British Columbia, Vancouver, BC Canada.
authors.forename: Teresa
authors.initials: T
authors.lastname: Liang
authors.affiliation: Department of Radiology and Imaging, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021 USA.
authors.forename: Anukul
authors.initials: A
authors.lastname: Panu
authors.affiliation: Department of Radiology and Diagnostic Imaging, University of Alberta Hospital, Edmonton, AB Canada.
authors.forename: Sean
authors.initials: S
authors.lastname: Crowther
authors.affiliation: Department of Radiology and Diagnostic Imaging, University of Alberta Hospital, Edmonton, AB Canada.
authors.forename: Gavin
authors.initials: G
authors.lastname: Low
authors.affiliation: Department of Radiology and Diagnostic Imaging, University of Alberta Hospital, Edmonton, AB Canada.
authors.forename: Robert
authors.initials: R
authors.lastname: Lambert
keywords: common peroneal nerve; denervation edema; foot drop; intraneural ganglion cyst; ultrasound-guided aspiration