A patient with extramedullary acute myeloid leukaemia involving the brachial plexus: Case report and review of the literature Brakiyal pleksusu tutan ekstramedüller akut miyeloid lösemili bir hasta: Vaka raporu ve literatürün incelenmesi

Acute myeloid leukaemia (AML) is a heterogeneous group of haematological disorders characterized by uncontrolled proliferation and infiltration of neoplastic haematopoietic cells in the bone marrow and blood. Extramedullary tissue involvement is not uncommon as part of the presentation in AML. Sites of involvement include liver, spleen, skin, gum, bone, testis and central nervous system (CNS). Leukaemia cutis representing leukaemic infiltration to skin occurs in about 10% of patients with AML and it is more common with the monocytic subtypes, including acute monocytic and myelomonocytic leukaemias (AML-M4/M5) [1]. However, CNS involvement in AML is a relatively uncommon manifestation. Leukaemic infiltration to brachial plexus is particularly rare. Herein, we report a case of extramedullary leukaemia infiltration of the brachial plexus and skin in a patient with relapsed AML.