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Castleman's disease (CD) is a rare, atypical, lymphoproliferative disease of unknown etiology. The most common location for CD is the mediastinum (63%) [1]. A retroperitoneal location has been reported in 7% of patients, with only 2% of cases involving the pararenal region [2]. For this reason, CD located in the retroperitoneum is difficult to differentiate from other benign or malignant lesions. Here, we report a patient with CD located in the anterior lower pole of the right kidney who had been diagnosed with a malignant Brenner tumor after hysterectomy. A 56-year-oldwoman visited our hospital with a chief complaint of a growing abnormal retroperitoneal mass. She had undergone a total abdominal hysterectomy (TAH) and bilateral salpingooophorectomy (BSO) due to a malignant Brenner tumor at another university hospital 3 months previously. Baseline serum levels of CA-125 and CA 19-9 were normal (5.59 U/mL and 8.11 U/ mL, respectively). An abdominal computed tomography (ACT) scan revealed a 3.0-cm nodule in the anterior lower pole of the right kidney that had been visualized by ACT prior to the TAH and BSO. The mass had increased in size over the course of 3 months (Figure 1). No distant metastases or other abnormal findings were noted on ACT. We suspected that the mass was a metastatic lymph node and performed laparoscopic retroperitoneal removal. The patient was placed in the dorsolithotomy position, and four ports were used for the procedure (Figure 2). The first assistant gradually rotated the telescope 180 clockwise from the pelvic

Laparoscopic treatment of Castleman's disease in a patient with a history of malignant Brenner tumor