Foot Drop Secondary to Intraneural Ganglion Cyst of the Common Peroneal Nerve

Abstract

Intraneural ganglion cysts, though rare, can cause significant neurological symptoms, with the common peroneal nerve (CPN) at the fibular neck being the most commonly affected site. We present the case of a 43-year-old female with acute foot drop and pain over the lateral knee, associated with a progressively enlarging swelling. MRI revealed an intraneural ganglion cyst of the CPN, extending proximally from the superior tibiofibular joint. Surgical intervention included cyst decompression, excision, articular branch ligation, and curettage of the proximal tibiofibular joint. Postoperatively, the patient showed significant motor and sensory recovery by 2 months, with full functional improvement at 12 months. This case underscores the importance of early diagnosis using imaging modalities and targeted surgical treatment. Addressing the articular connection and decompressing the cyst are critical to achieving optimal outcomes and minimizing recurrence