[A Methotrexate-Associated Malignant Lymphoma with Laparoscopic Resection of the Pericardium].

: We report a case of a malignant lymphoma that was treated with laparoscopic resection of the pericardium. A 43-year-old woman was diagnosed with asymptomatic extrahepatic nodule by medical examination. CT, MRI, and PET-CT examination indicated a solitary fibrous tumor(SFT). Therefore, we performed laparoscopic resection for definitive diagnosis and treatment. The tumor was located in the upper abdominal wall and adhered to the liver; hence, we additionally performed partial resection of the liver. Thereafter, we dissected the tumor from the abdominal wall alongwith a part of the diaphragm. Because intraoperative pathological examination revealed more malignancy than was preoperatively expected, we also resected a part of the pericardium. The laparoscopic approach to the pericardium can be performed safely because of its magnification effect, which is an advantage of laparoscopic surgery.