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. 2025 Dec 20:2025:5671959.
doi: 10.1155/criu/5671959. eCollection 2025.

Robot-Assisted Laparoscopic Partial Nephrectomy for Mixed Epithelial and Stromal Tumor of Kidney: A Case Report

Sachie Kaichi  1 , Hotaka Matsui  1   2 , Sayuri Takahashi  1 , Kazuki Akiyama  2 , Daiji Watanabe  2 , Satoru Taguchi  2 , Yuta Yamada  2 , Daisuke Yamada  2 , Mariko Tanaka  3 , Haruki Kume  1   2
Affiliations

Robot-Assisted Laparoscopic Partial Nephrectomy for Mixed Epithelial and Stromal Tumor of Kidney: A Case Report

Sachie Kaichi et al. Case Rep Urol. .

Abstract

Mixed epithelial and stromal tumor (MEST) of the kidney is a rare and distinctive neoplasm accounting for 0.2% of all renal tumors. The general treatment for MEST typically involves radical nephrectomy or partial nephrectomy. We report a rare case of MEST successfully treated with robot-assisted partial nephrectomy (RAPN), which, to our knowledge, represents the first documented instance of this approach. The patient is a 53-year-old woman with an incidental right renal tumor. The patient visited a primary care physician for chest pain. Computed tomography (CT) scan revealed a 3.5-cm lesion in the upper pole of the right kidney and was suspected of renal cell carcinoma. The patient was subsequently referred to the department and was admitted to our department for RAPN. We experienced the first case of RAPN performed for MEST of the kidney. Histopathological and immunohistochemical analyses confirmed the diagnosis of MEST. This case highlights the feasibility of robot-assisted laparoscopic surgery as a minimally invasive treatment option for MEST.

Keywords: MEST; case report; partial nephrectomy; robotic surgery.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

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Figure 2
(a–d) The surgery was performed using the Da Vinci Xi Surgical system (Intuitive Surgical, Sunnyvale, CA, United States). The tumor was confirmed by ultrasound and removed along with the surrounding fat tissue.
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See this image and copyright information in PMC

References

    1. Hideyuki T., Kazuhide M., Masahiro Y., Miki M., Futoshi S., Kaoru K., Takayuki M., Noboru N., Takehiko O., Hiroji U., Masahiro Y., Yoshinobu K., Yoshiaki I., and Yoji N., Mixed Epithelial and Stromal Tumor of the Kidney: A Case Report, Hinyokika Kiyo. (2009) 55, no. 8.
    1. Michal M. and Syrucek M., Benign Mixed Epithelial and Stromal Tumor of the Kidney, Pathology Research and Practice. (1998) 194, no. 6, 445–448, 10.1016/S0344-0338(98)80038-1, 2-s2.0-0031872532. - DOI - PubMed
    1. Tatsuya S., Hirotaka A., Yuki A., Akiko T., Masahiro H., Shigeo O., Shuji M., Ryuichi M., Mototsugu O., and Masahiro J., Radiologic Features of Mixed Epithelial and Stromal Tumors of the Kidney: Hyperattenuating on Unenhanced Computed Tomography and T2-Hypointensity on Magnetic Resonance Imaging, Radiology Case Reports. (2021) 16, no. 4, 858–862, 10.1016/j.radcr.2021.01.048. - DOI - PMC - PubMed
    1. Bakavičius A., Barisienė M., Snicorius M., Valančienė D., Dasevičius D., Žalimas A., Kvaščevičius R., Ramonas H., Sokolovas V., and Jankevičius F., Malignant Mixed Epithelial and Stromal Tumour of the Kidney: A Case Report and a Literature Review, Acta Medica Lituanica. (2018) 25, no. 1, 31–37, 10.6001/actamedica.v25i1.3701. - DOI - PMC - PubMed
    1. Volpe A., Finelli A., Gill I. S., Jewett M. A. S., Martignoni G., Polascik T. J., Remzi M., and Uzzo R. G., Biopsy of Renal Masses: When and Why, Nature Reviews Urology. (2015) 12, no. 5, 240–249.

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