Unusual lipid poor spindle cell lipoma.

Spindle cell lipomas (SCLs) containing minimal fat are rare and can be diagnostically challenging due to their similar radiographic appearance to other benign and malignant tumours. SCLs are benign lipomatous tumours that typically occur in middle aged to elderly men as slow-growing, painless masses in the subcutaneous tissue of the posterior neck, shoulders or back. However, rarely these tumours can arise in unusual locations such as the lower extremities. We present an unusual case of a lipid poor SCL occurring in the lower extremity. Initial clinical and radiographic findings were suspicious for a malignancy. Two core biopsies demonstrated benign fibro collagenous tissue, so a marginal excision was performed. Final histopathological and immunohistochemical stains confirmed the diagnosis of an SCL. Radiologists, pathologists and oncologic surgeons should be aware of this lipomatous tumour's potential to present in unusual locations with minimal fatty components to increase confidence in radiologic-pathological concordance.

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Competing interests: None declared.