A Case of Laparoscopically Resected Mesorectal Metastasis of a Primary Solitary Fibrous Tumor of the Brain

Abstract

A 68-year-old woman underwent tumorectomy of a solitary fibrous tumor (SFT) of the brain at another hospital, followed 9 years later by left lobectomy for lung metastasis. Multiple liver metastases subsequently appeared, and she was referred to our department for transarterial embolization and radiofrequency ablation. In a follow-up computed tomography (CT) scan 14 years after the original brain tumor surgery, a 3-cm mass was observed on the left side of the rectum. Recurrence was also evident in the brain and lung, but since the rectal tumor was growing at a faster rate than the other lesions, it was decided to remove it laparoscopically to avoid the risk of rectal obstruction. Intraoperatively, the tumor was found to be located entirely within the mesorectum, and it was successfully removed with a sufficient margin without rectal resection. Histopathological testing confirmed that it was an SFT metastatic lesion. SFT was previously reported to be a mesenchymal tumor arising from the pleura, but in recent years, its occurrence in all parts of the body has been reported. However, there has been no previous reported case of a mesorectal metastatic lesion of a primary tumor in another organ or of the resection of a metastatic lesion within the mesorectum. The treatment of a patient with a mesorectal metastasis of a primary SFT of the brain that was laparoscopically resected is reported.