<prompt> Brown tumour is seen in-Increased ptfcathyroid hormoneIncreased thyroxineIncrease thyroidIncreased calcitonin  <response>: Brown tumour is seen in hyperparathyroidism. Brown tumours are not actually tumours but are localised accumulations of hemorrhage and blood pigments and reactive masses of osteoclasts in a spindle shaped stroma. Ref:harrison 