twenty-two out of 31 patients with chronic renal failure and secondary hyperparathyroidism who underwent parathyroidectomy before operation underwent non-invasive image diagnosis of parathyroid glands by computed tomography ( ct ) , scintigraphy with 201tlcl and 99mtco4+ , and/or ultrasonography .
C0079989
parathyroidectomy
C0030518
parathyroid glands