A thirty-seven-year-old male patient presented with dysphagia and hoarseness six months after complete remission of acute myeloid leukemia (AML-M0), which had been treated with chemotherapy. Physical examination revealed left vocal cord paralysis and involvement of the 9th, 10th, and 12th cranial nerves. Sagittal and axial magnetic resonance scans of the nasopharynx and neck showed a mass in the left retropharyngeal and perivertebral regions, 6x4 cm in size; another mass in the left vallecula, and infiltration of the right preepiglottic tissue by another mass of 2 cm. There was no bone marrow involvement. A diagnosis of granulocytic sarcoma without leukemia relapse was made and the FLAG-Ida regimen was administered, after which partial regression of the masses was observed. However, the patient died due to a pulmonary infection on the 17th day of chemotherapy.