[A Case of Myeloid Sarcoma in the Small Intestine Presenting with Intussusception]

A sixty-something man presented with lower abdominal pain in early Y month 20XX, and was examined at the hospital's internal medicine outpatient clinic. An abdominal CT showed a soft tissue mass around the left hip joint, and multiple enlarged lymph nodes from inside the pelvis to the mesentery of the abdomen. We noted a small-intestinal intussusception in the lower right abdomen, and suspected malignant lymphoma. We did a CT-guided biopsy on the left hip joint soft tissue mass, and performed surgery on the small-intestinal intussusception. During surgery, we noted an approximately 30 cm ileal intussusception located about 60 cm from the terminal ileum, and enlarged lymph nodes in the nearby mesentery. We removed the ileal intussusception. The pathological diagnosis was myeloid sarcoma, and the soft tissue mass in the left hip joint was also diagnosed as myeloid sarcoma. We performed a bone-marrow biopsy at the hematology department, and diagnosed acute myeloid leukemia M2. We then started remission-induction therapy and consolidation therapy, and the patient was diagnosed as in remission in Y+5 month 20XX. We also need to keep in mind myeloid sarcoma in the intestine as a subtype of acute myeloid leukemia, as malignant tumor in the small intestine presenting with intussusception.