Online Articles: Case ReportsAn Unusual Cause of Paralysis of the Peroneal Nerve A Report of 3 CasesAl Mufargi, Yaqoub Sulaiman MD, SSC-orth; Mouch, Charles Adam; Ziebarth, Kai MD; Joeris, Alexander MD; Slongo, Theddy MD Author Information Departments of *Surgery ‡Pediatric Surgery, Bern University Children Hospital, Switzerland †University of Michigan, Ann Arbor, MI, USA None of the authors received financial support for this study. Reprints: Yaqoub Sulaiman Al Mufargi, MD, SSC-orth, Department of Pediatric Surgery, Bern University Children Hospital, 3010 Bern, Switzerland. e-mail: [email protected]. Journal of Pediatric Orthopaedics: July/August 2011 - Volume 31 - Issue 5 - p e50-e52 doi: 10.1097/BPO.0b013e31821f50cb Buy Metrics Abstract We present 3 cases of a 12-year-old boy, an 8-year-old girl, and a 9-year-old boy with progressive paresis of the peroneal nerve. Peroneal intraneural ganglia are a rare cause of paralysis of the lower limb in children; more often these symptoms occur because of exostosis. Ultrasound imaging in both patients showed a cystic mass near the fibular neck. Magnetic resonance imaging examination revealed that the ganglion is communicating with the proximal tibiofibular joint. Surgical exploration in these patients confirmed a cystic formation involving the common peroneal nerve. The ganglion originates from the articular nerve branch to the proximal tibiofibular joint. Total recovery of nerve function was seen 2 years later for the first patient, whereas the other 2 showed immediate postoperative improvement of peroneal nerve function and complete recovery within 6 to 8 weeks. On the other hand, patients with exostosis showed varying outcomes. In children with symptoms suspicious of nerve compression, fast diagnosis and immediate treatment are necessary to ensure the best possible recovery. Copyright © 2011 Wolters Kluwer Health, Inc. All rights reserved.