A case of intraneural ganglion cyst of the peroneal nerve: A rapid recovery after incision of cyst

Intraneural ganglion cysts (INGCs) are an infrequent cause of foot drop. INGCs
are benign mucinous cysts within the epineurium of peripheral nerves, which are usually
observed in the peroneal nerve at the knee typically leading to symptoms and signs of peripheral
neuropathy.
A 40-year-old man with foot drop who had undergone a spinal study for discopathy
was examined in this study. The patient had peroneal nerve compression at the neck of the
fibula resulting from an extra neural cyst. Surgical exploration revealed an intraneural cyst.
Epineurium was incised and the cyst was evacuated. In a two-week post-surgery follow up, his
foot drop had improved partially and the remainder of his symptoms resolved.
Awareness of the intraneural cysts of peroneal nerve as a cause for foot drop is
important because early surgical intervention could reverse the course of disease.