Fig. 3From: Severe hypercalcemia caused by parathyroid hormone in a rectal cancer metastasis: a case reportModified Casanova test to determine the source of PTH secretion. a A blood pressure cuff excluded the bone metastasis in the right fibula from circulation while systemic PTH and calcium levels were measured every 5 min. b A marked drop in PTH (blue line) during the 20 min ischemia confirmed PTH production in the right lower legBack to article page