Purpose or Case Report: A four-year-old girl was referred to our service to investigate a mass in her left forearm. About a year before she had cellulitis in the same place which was treated and resolved with antibiotics. A month previous to our consult she notices a soft tissue swelling in her left forearm and a pediatrician referred her to an oncologist for investigation.
On physical examination, she presented with a medial bulging in her left forearm with local pain and no inflammatory signs. There was no history of fever.
The plain radiograph showed a lytic lesion oriented along the axis of the ulna surrounded by fading sclerosis. In the Computed Tomography there was a lytic lesion with periosteal new bone formation.
The diagnosis was Brodie’s abscess which is a form of subacute osteomyelitis. It is a collection of purulent material surrounded by granulation tissue and reparative sclerotic bone. Staphylococcal Aureus is the most common organism to lead to this entity but any pyogenic organism can cause it. Osteomyelitis is the result of bone infection being the trabecular and cortical involved. It can be spread by exogenous and contiguous or endogenous due to hematogenous spread.
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