<prompt> Most common cause of hypercalcemic crisis is:Carcinoma breastParathyroid hyperplasiaParathyroid adenomaPagets disease  <response>: Answer is A Carcinoma Breast: The most common cause of hypercalcemic crisis is malignancy. Hypercalcemic crisis due to primary hyperparathyroidism is rare - Surgical Oncology 1St 2003601 Amongst the options provided, carcinoma breast is the single best answer of choice. Hypercalcemic Crisis Hypercalcemic crisis refers to the presence of severe hypercalcemia and is defined arbitrarily as a total calcium 14mgd1 3.5 mmo11 The most common cause of hypercalcemic crisis is malignancy and the most common cause is believed to be 