Malignant granular cell tumour of the lower limb--a case report and review of the literature.

Granular cell tumour is a rare tumour of undetermined origin. Fewer than 1000 cases have been reported and less than 40 cases of malignant forms of this tumour have been described in the literature. We report a single case of the malignant form of granular cell tumour in the lower limb and review the literature regarding the possible origin of this tumour. Presently, wide surgical excision is the only modality of treatment for this lesion.