Epithelioid inflammatory myofibroblastic sarcoma responsive to surgery and an ALK inhibitor in a patient with panhypopituitarism.

We encountered a case of epithelioid inflammatory myofibroblastic sarcoma (EIMS) originating from an abdominal organ that rapidly regrew twice. The patient underwent two surgeries. Large tumors grew within three months after the second surgery. The patient subsequently received chemotherapy with an anaplastic lymphoma kinase (ALK) inhibitor. Although EIMS has a poor prognosis, the patient continues to be alive with disease 14 months after surgical treatment and the administration of the ALK inhibitor.