[Breast Cancer Metastasis to the Mesentery Diagnosed Via Laparoscopic Biopsy-A Case Report].

Breast cancer can metastasize to organs all over the body, but isolated mesenteric metastases are rare. A 72-year-old female, with a history of invasive lobular carcinoma of the breast treated with breast-conserving therapy and axillary lymphadenectomy 7 years previously and 5 years of endocrine therapy, presented with asymptomatic elevated serum carcino- embryonic antigen. Computed tomography(CT)revealed no obvious distant metastasis, but showed increased adipose tissue density around the pancreas suggestive of acute pancreatitis. During follow-up, in addition to the abnormality around the pancreas, mild thickening of the mesentery was observed on CT. Definitive diagnosis of mesenteric metastasis of invasive lobular carcinoma was confirmed via laparoscopic biopsy. It was supposed that the breast cancer had first metastasized to the retroperitoneum via the hematogenous route, and had then directly infiltrated the mesentery. Laparoscopic biopsy is effective for diagnosis of intra-peritoneal metastases.