<prompt> In hyperparathyroidism, all are seen exceptOsteopetrosisOsteoporosisCystsBrown tumor  <response>: Parathyroid hormone PTH, also called parathormone or parathyrin, is a hormone secreted by ... most, 60-70, of it in the proximal tubule, except in the thin segment of the loop of Henle. ... while secondary hyperparathyroidism is an appropriately high PTH level seen as a physiological ... A mouse for all reasons. 