AUER vesicles, also known as Austrian vesicles, are also called rod-shaped vesicles because these vesicles often form matchsticks in leukemic cells. AUER vesicles are commonly found in patients with acute granulocytic leukemia, especially in patients with acute promyelocytic leukemia, which is one of the most common morphological features of acute promyelocytic leukemia, but AUER vesicles are rarely seen in patients with acute lymphoblastic leukemia. Acute lymphoblastic leukemia patients do not have a large number of granules in the cytoplasm, and they do not make rod-shaped vesicles, so the rod-shaped vesicles can be used to distinguish whether the diagnosis is acute granulocytic leukemia or acute lymphoblastic leukemia. When acute promyelocytic leukemia patients are in remission after treatment with retinoic acid and arsenious acid, the rod-shaped vesicles in the cells will disappear when they are examined again.