An unusual clinical presentation of a rare renal tumour.

We report an unusual clinical presentation of renal leiomyosarcoma. A woman, who received renal transplant from her mother, was diagnosed to have leiomyosarcoma in the donated kidney. The mother was found to have a right upper lobe lung mass 10 years later, which was diagnosed as leiomyosarcoma. It is possible that the mother had primary leiomyosarcoma of the donated kidney with micrometastases to the lung 10 years previously, which developed into a lesion in the donated kidney in her daughter. Ten years later, the slow-growing metastatic leiomyosarcoma developed into a lung mass.