<prompt> Brown tumor of bone is seen in -HyperparathyroidismHypoparathyroidismHypo-thyroidismHyperthyroidism  <response>: Ans. a HyperparathyroidismRef: R 9thpg 1102Skeletal Abnormalities in Hyperparathyroidism:Osteoporosis- cortical bone more severely involved than medullary boneBrown tumors: brown colour- due to increased vascularity, hemorrhage hemosiderin depositionOsteitisfibrosacystica von Recklinghausen disease of bone 