(A) Bone marrow aspirate showing blasts with a single Auer rod (thick arrow; Giemsa, ×100). (B) Few myeloperoxidase (MPO)-positive blasts; inset shows an MPO-positive Auer rod (thin arrow; MPO, ×100). (C) Blasts are cCD3, CD34, CD117, and CD7 positive and cMPO, CD5, and CD33 negative.