2026-03-15T04:42:27Z https://repository.lib.tottori-u.ac.jp/oai

oai:repository.lib.tottori-u.ac.jp:02001878 2025-10-01T05:24:51Z 1:9 2:12 23:34:1744609014513:1758242795228

Two Cases of Papillary Renal Neoplasm with Reverse Polarity : Radiologic–Pathologic Correlation Gonda,Takuro 15101 鳥取大学 Tottori University Yamaji,Daisuke 15101 鳥取大学 Tottori University 00724808 Yunaga,Hiroto 夕永,裕士 15101 鳥取大学 Tottori University Murakami,Atsushi 村上,敦史 15101 鳥取大学 Tottori University Ochiai,Ryoya 落合,諒也 15101 鳥取大学 Tottori University Ozaki,Kanae 尾崎,加苗 15101 鳥取大学 Tottori University Makishima,Karen 牧嶋,かれん 15101 鳥取大学 Tottori University 10379638 Fujii,Shinya 藤井,進也 15101 鳥取大学 Tottori University open access (C) 2025 Tottori University Medical Press computed tomography magnetic resonance imaging papillary renal cell carcinoma papillary renal neoplasm with reverse polarity Papillary renal neoplasm with reverse polarity (PRNRP) is a distinct subtype of papillary renal tumors first described in 2019. Here, we present the imaging and histopathological findings of two cases of PRNRP. Case 1 involved a 71-year-old man with an incidental right renal mass. A 30 mm tumor in the right kidney exhibited isoto slight hyperattenuation on non-contrast computed tomography (CT). Dynamic contrast-enhanced (DCE)-CT revealed a tumor with solid and cystic components. The solid portion showed mild enhancement, followed by gradual enhancement. Regarding magnetic resonance imaging (MRI), the cystic component revealed mild hyperintensity on T2-weighted imaging (WI) and hyperintensity on T1WI. The small, lobulated solid component showed hyperintensity on T2WI and no apparent hyperintensity on diffusion-weighted imaging, with high ADC values. Case 2 involved a 74-year-old woman with a gradually enlarging left renal mass. A 20 mm tumor in the left kidney showed heterogeneous mild hyperattenuation on non-contrast CT. On DCE-CT, a small solid component exhibited mild enhancement, followed by gradual enhancement. Retrospectively, the mass showed an 8 mm homogeneous nodule on CT images obtained 7 years earlier. Although the tumor appears heterogeneous on CT, a small PRNRP may exhibit homogeneous attenuation. Additionally, the solid portion can show T2 hyperintensity related to stromal edema. Recognition of these imaging variations is important for the correct diagnosis of PRNRP. Tottori University Medical Press 2025-05-27 2025-05-27 eng journal article VoR https://repository.lib.tottori-u.ac.jp/records/2001878 https://doi.org/10.33160/yam.2025.05.008 https://www.lib.tottori-u.ac.jp/yam/yam/yam68-2/68-2contents.html 05135710 13468049 Yonago Acta Medica 68 2 4 161 164 https://repository.lib.tottori-u.ac.jp/record/2001878/files/yam68(2)_161.pdf application/pdf 2.7 MB 2025-06-02 2025-05-27