2020 Volume 11 Issue 2 Pages 165-171
A 51-year-old woman underwent a CT scan performed that revealed a neoplastic lesion in the upper abdomen, and she was referred to our surgical department. Abdominal CT showed a tumor of about 50 mm lying between the posterior wall of the gastric minor curvature and the pancreas. Continuity with the surrounding tissue was not clear. Ultrasonography showed that the tumor was mobile on postural change, and it was considered to originate from the mesentery. In addition, PET scanning showed mild accumulation, and MRI showed limited diffusion, suggesting the possibility of malignancy. Laparoscopic tumor resection was performed as a diagnostic treatment. Intraoperative findings showed tumor continuity only with the lesser omentum, and the patient was judged to have a primary tumor of the lesser omentum. Histopathological findings showed proliferation of myofibroblasts and lymphocyte infiltration, and the patient was thus diagnosed as having an inflammatory myofibroblastic tumor. Inflammatory myofibroblastic tumor as a primary tumor of the lesser omentum is rare and is reported here along with a literature review.
