Giant Peroneal Ganglion Cyst: Imaging and Clinical Findings

Özkan Özen*, Alptekin Tosun, Kürşad Aytekin and Cem Zeki Esenyel

Giant Peroneal Ganglion Cyst: Imaging and Clinical Findings.

Ganglion cyst thought to be the result of myxoid degeneration of joint capsule and tendon sheath connective tissue. This lesion frequently origins from joint capsule, although may also originate from tendon sheath, muscle, nerve, and period. Hand-wrist, foot-ankle are the most common locations respectively.

A study on knee magnetic resonance imaging revealed 0.76% of the incidence of the peroneal ganglion cysts. Ganglion cysts are the typical lesions although peripheral nerve compression is rare.

Peroneal ganglion cysts may lead neuropathy with pain, loss of sensation, weakness on six of the foot ankle and peroneal nerve palsy due to compression of the adjacent peroneal nerve. In this report, we demonstrate a tendon sheath originated peroneal ganglion cyst in large diameter at the proximal musculotendinous junction of peroneus longus muscle proceed to downward in muscle causes severe pain and loss of sensation on cruris.

A 37-year-old man applied to a hospital with one-year progressive swelling on the lateral portion of left knee below and pain on the left foot back. In anamnesis, the pain was continuous in last 2 weeks. Physical examination revealed a large, rigid, immobile lesion in the pain location.

The patient had loss of sensation on the anterolateral portion of the left cruris below. Ultrasound imaging revealed an 8 cm in length and 3 cm in diameter at its widest point anechogenic cystic lesion spread with a narrow diameter from the left fibula head level to inferior. MRI to characterize the lesion demonstrated an 83×35 mm lesion that was hypointense on T1- and hyperintense on T2-weighted imaging.

Radiol Open J. 2016; 2(1): 4-6. doi: 10.17140/ROJ-2-112