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A benign ancient schwannoma of the tibia nerve

A 46-year-old man, an engineer, presented with chronic left calf pain and tingling sensation in the foot for the past 2 years. There was no history of associated back pain and spine MRI study (performed elsewhere) was essentially normal. Several medics had treated the patient conservatively, yet his symptoms persisted. At the time of presentation, he also pointed out a slow growing swelling in the left popliteal fossa, of 3 months’ duration. Clinical examination revealed a small, mobile, non-pulsatile, non-transilluminant, non-tender soft tissue swelling in the popliteal fossa.

Ultrasonography of the popliteal fossa observed a well-defined heterogeneous mass suggestive of a Baker's cyst. In prone position, the popliteal fossa was exposed through a lazy S incision. …