<prompt> 12 years male came with swelling of lower end tibia which is surrounded by rim of reactive bone. What is most likely diagnosis?GCTBrodies AbscessHyper PTHOsteomyelitis  <response>: GCT - occurs around 20-40 years of age Hyperparathyroidism - typically in a female around 30 years of age; presents with lytic lesion Brodies abscess - swelling in the lower end of tibia and radiological evidence of cavity surrounded by a halo of sclerosis rim of a reactive bone point towards brodies abscess. 