A 1-year-old girl presented with vomiting for 1 week. Abdominal ultrasound revealed a mass with increased blood flow in the left lower abdomen. A malignancy was suspected. 18 F-FDG PET/CT showed multiple lesions in the left ventricular wall, the kidney, and the left lower abdomen. Biopsy of the left abdominal mass confirmed the diagnosis of myeloid sarcoma associated with acute myeloid leukemia. After 4 cycles of chemotherapy, follow-up PET/CT was performed for evaluating the therapy response, which showed complete resolution.
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