A case of renal pseudotumor associated with chronic pachymeningitis

Background: A 56-year-old woman was referred to our hospital with a left re nal mass. Methods/Results: Radiologic studies demonstrated a solitary space-occupying lesion in the left kidney and a malignant tumor was suspected. Left radica l nephrectomy was then performed. Pathological examination revealed a scler otic fibrous lesion with a rather distinct margin and no evidence of malign ancy. These pathological findings were consistent with the diagnosis of a r enal pseudotumor. Conclusions: This patient had a history of chronic pachymeningitis that for med a thoracic epidural focus causing spinal cord compression and the histo logic appearance of this focus was similar to the renal lesion. It was conc luded that this was a rare case of a renal pseudotumor associated with mult ifocal fibrosclerosis.