Extramedullary myeloid cell tumour: presentation as anterior chest wall mass during AML relapse

Acute myeloid leukaemia is an uncommon but an important cause of soft tissue swellings. Such extrameningeal, extramedullary leukaemic infiltrates are called extramedullary myeloid cell tumours. Despite their large size they may respond well to chemotherapy and local radiotherapy, as is demonstrated in this case.