RT Journal A1 DeGroote JW T1 ACute intermittent hyperparathyroidism with hemorrhage into a parathyroid adenoma JF JAMA JO JAMA YR 1969 FD June 16 VO 208 IS 11 SP 2160 OP 2161 DO 10.1001/jama.1969.03160110132027 UL http://dx.doi.org/10.1001/jama.1969.03160110132027 AB Emergency parathyroidectomy effected a successful cure of a patient with severe hypercalcemia due to acute hyperparathyroidism. This patient experienced a spontaneous remission of probable acute hyperparathyroidism nine months prior to surgery. It is noted that painful hemorrhage into a parathyroid adenoma coincident with the clinical symptoms of acute hypercalcemia is exceedingly rare.