Case Reports and Series| Volume 56, ISSUE 6, P1328-1331, November 2017

Metatarsal Periosteal Plantar Ganglion Cyst Associated With Stress Fracture: A Case Report


      We encountered a rare case of a periosteal ganglion cyst at the plantar aspect of the metatarsal that induced a stress fracture in a 77-year-old female. The clinical manifestation of the plantar ganglion cyst of the foot was not evident because of its location deep beneath the plantar fascia. A pressure cortical indentation was detected at the metatarsal neck on the initial radiographs. Magnetic resonance imaging showed a stress fracture of the metatarsal with a ganglion cyst. The stress fracture was thought to have resulted from several factors, including structural weakness due to bony absorption from the ganglion cyst, osteoporosis that induced a fragility fracture, and a load-induced fatigue fracture. The fracture completely healed following complete resection of the ganglion cyst with the surrounding periosteum along with medication for osteoporosis. When confirmation of a stress fracture is necessary or when presentation of a stress fracture is atypical, magnetic resonance imaging should be considered to confirm or rule out any other associated pathologic features. Resection of the periosteal ganglion cyst with the surrounding periosteum is important to prevent recurrence.

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