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. 2021 Jul 27;7(1):E25–E34. doi: 10.1055/a-1522-8969

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 6 — Highly suspicious lesion; Bosniak IV. a 6 cm hypodense lesion in the pars intermedia of the left kidney with a density between 20 and 30 Hounsfield units on contrast-enhanced CT (arterial phase). b In the portal venous phase, the lesion shows density values up to 40 Hounsfield units, but with enhancement of the septae. c On the B-mode image, low echoes with solid, echo-rich parts are displayed (arrows). d CEUS shows strong partial enhancement (circle) extending to the center, matching the vessels at the edges of the lesion. The lesion was classified as a partially cystic, partially solid tumor (Bosniak IV). Histologically it was a papillary renal cell carcinoma.