Compression of the ulnar nerve in Guyon's canal by uremic tumoral calcinosis

We describe the case of a 70-year-old woman with chronic renal failure on h aemodialysis presenting with an ulnar nerve compression in Guyon's canal se condary to uremic tumoral calcinosis. Excision of calcium deposits and exte rnal neurolysis of the ulnar nerve were successfully performed. Simultaneou sly, the hyperphosphatemia and hypercalcemia were corrected. The pathogenes is of this condition is different from primary tumoral calcinosis. Clinical and radiological features and therapy are discussed. Uremic tumoral calcin osis is an unusual etiology of ulnar nerve compression in Guyon's canal not previously reported in dialysis patients.