Which term describes a localized, walled-off collection of pus within bone due to osteomyelitis?

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In osteomyelitis, a localized, walled-off collection of pus inside the bone is called a Brodie abscess. It represents a subacute intramedullary abscess where pus becomes contained within the bone by surrounding reactive bone, rather than spreading widely. This is the term that specifically describes a confined pus-filled cavity within bone.

Other terms refer to different aspects of the infection: a sequestrum is a piece of dead bone that has separated from living bone due to the infection, not the pus collection itself; involucrum is the new bone formed around that dead fragment; and a cloaca is the drainage opening through the involucrum that allows pus to exit. While the abscess can be associated with these changes, the defining feature being asked for—the localized, walled-off pus within bone—is the Brodie abscess.