title: Renal medullary "rings": possible CT manifestation of hypercalcemia.
abstract: Bilateral dense rings in the renal medulla were found on noncontrasted computed tomography in a patient with marked hypercalcemia and suspected primary hyperparathyroidism. The rings were not present on plain radiographs and were obscured on contrasted scans, and may represent occult nephrocalcinosis. Associated findings--renal insufficiency induced by hypercalcemia and interstitial nephritis--may be reversible with early recognition of this CT finding.
mesh_terms: D000328:Adult; D005710:Gallium Radioisotopes; D006801:Humans; D006934:Hypercalcemia / Q000150:complications*; D006961:Hyperparathyroidism / Q000150:complications; D007679:Kidney Medulla / Q000000981:diagnostic imaging*; D008297:Male; D009395:Nephritis, Interstitial / Q000150:complications; D009397:Nephrocalcinosis / Q000000981:diagnostic imaging* / Q000209:etiology; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed
chemical_list: D005710:Gallium Radioisotopes