Renal medullary fibroma is a benign kidney tumour. It is commonly an incidental finding. Signs and symptoms Renal medullary fibromas are typically asymptomatic. Diagnosis Renal medullary fibromas are diagnosed by pathologists based on the examination of tissue. They consist of bland spindle-shaped or stellate-shaped cells in a loose stroma. Renal tubules may be entrapped. Treatment Generally, no treatment is required. See also Kidney tumour Kidney cancer References External links Benign renal neoplasms