Large schwannoma of the sciatic nerve

Description

A 40-year-old woman was referred with an 8-month history of fullness of the right posterior thigh. This was associated with pain, primarily on sitting and occasional radicular pain down the ipsilateral leg. On examination a mobile, firm lump was identified that was tender to palpate and which also elicited a shooting pain down the leg on examination. MRI demonstrated a well-defined multiloculated mass 9 cmsx6 cms which appeared to arise from the sciatic nerve, raising suspicion for a schwannoma (figure 1). A biopsy confirmed the diagnosis of schwannoma. Surgical excision was undertaken, carefully dissecting the lesion from the sciatic nerve (figure 2). The patient had an uneventful postoperative recovery without neurovascular deficits.

Figure 1

A coronal (A) and axial (B) T1-weighted MRI of a well-defined multiloculated mass 9 cmsx6 cms arising from the sciatic nerve.

Figure 2

Schwannoma lesion excised en...

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