Cystic nephroma: A bosniak III benign tumor in the kidney

doi:10.1016/j.ajur.2020.02.004

Asian Journal of Urology, 2021, 8 (2): 243-245 doi: 10.1016/j.ajur.2020.02.004

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Cystic nephroma: A bosniak III benign tumor in the kidney

Ke Ren(

),Xin Gou

Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China

Abstract
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The CT scan imges. (A) Plain scan: The density of the solid wall ranged from 13 to 35 HU, a little higher than that of the kidney cortex which ranged from 4 to 31 HU, while the density of the cyst content ranged from -4 to 16 HU; (B) Arterial phase: Slight contrast was found in the solid wall which ranged from 20 to 81 HU while the density of the kidney cortex ranged from 37 to 167 HU, but no contrast was found in the cyst content; (C) Venous phase: The density of the solid wall ranged from 33 to 135 HU, which was higher than that in the arterial phase, while the density of the kidney cortex ranged from 31 to 112 HU, which was lower than that in the arterial phase. CT, computed tomography.

The section of the tumor specimen: Compact yellow stroma and cystic cavity of various sizes, with colorless transparent liquid inside the cavity. The inner surface of the cavity was smooth with no papillary structures or soft tissue adhering.

The pathological and immune stain result of the specimen. (A) HE 40×: The inner surface of the cavity was covered with a single layer of cuboid epithelium, with some distinctive hobnail epithelium therein; (B) HE 100×; (C) Positive ER stain, 200×; (D) Positive PR stain, 200×. HE, hematoxylin-eosin; ER, estrogen receptor; PR, progestrone receptor.

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