Medial collateral ligament-ganglion cyst: A rare case report
Ganglion cysts are found in locations which are under constant stress. Although somewhat controversial, one common explanation for the formation of ganglion cysts is that they are the result of mucoid cystic degeneration in collagenous structures. The present case has been reported in the Journal of Orthopaedics and Allied Sciences.

A 58-year-old male presented with a painful swelling on the medial aspect of the right knee. The swelling was slowly progressive in nature for the last 5 years. On examination, a palpable soft mass measuring about 7.5 cm × 4.0 cm was found to be sitting over the medial joint line.

Plain roentgenography showed bulging soft tissue over the medial aspect of the right knee with cortical erosion of medial aspect of the proximal tibia and distal femur. Sonography revealed a hypoechoic soft-tissue cystic swelling 47 mm × 37 mm size over the medial aspect of right knee showing thick wall and particulate contents.

Coronal and axial T2-weighted magnetic resonance images revealed a large tibial collateral ligament bursa communicating to the joint surface.

Diagnostic arthroscopy was performed before surgical excision of the mass to rule out a parameniscal cyst, and a degenerative meniscal tear was found. Histopathologic examination of the excised mass was found to be a ganglion cyst. On 18 months follow-up, patient has no recurrence of swelling and having only mild osteoartritic symptoms.

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Dr. A●●●t S●●●●a Orthopaedics
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