[Acute promyelocytic leukemia complicated with central nervous system involvement successfully treated with all-trans retinoic acid via nasogastric tube].

At initial diagnosis, central nervous system (CNS) involvement in acute promyelocytic leukemia (APL) is rare. Here, we report a case of newly diagnosed APL with CNS involvement that was successfully treated with all-trans retinoic acid (ATRA)-combined chemotherapy. A 64-year-old woman was referred to our hospital to evaluate a bleeding tendency, and she was diagnosed with APL. Induction chemotherapy with ATRA via a nasogastric tube was initiated under mechanical ventilation because of respiratory failure and disturbance of consciousness. Although her respiratory condition improved a few days after initiating treatment, the disturbance of consciousness remained. Brain magnetic resonance imaging showed mixed signals of tumor infiltration and acute cerebral infarction with a focus on the right cerebellum. The patient was diagnosed with CNS involvement of APL and acute cerebral infarction. Three months after the initiation of induction therapy, her consciousness improved along with the reduction in CNS involvement, and complete molecular remission was achieved. Thus, patients with APL can have CNS involvement at initial diagnosis. Administering ATRA via nasogastric tube can be a good therapeutic option in patients with difficulty swallowing due to disturbance of consciousness.