The prognosis and preferred management of breast implant-associated anaplastic large cell lymphoma is dependent on whether lymphoproliferative cells are confined to within the fibrous capsule, in an effusion or lining the fibrous capsule, or if there is spread beyond the capsule in the form of a mass lesion. We describe a case where 18F-fludeoxyglucose positron emission tomography-CT was used to confirm localized disease and guide management decisions.