Lesions that do and do not need follow-up

Lesions that do not need follow-up	Lesions that need follow-up*
Simple (Bosniak I) cyst Minimally complex cyst (Bosniak II) Pseudotumor^¶	Complex cysts (Bosniak IIF, III, or IV) Solid contrast-enhancing mass^Δ Vascular malformations Angiomyolipoma Indeterminate lesions^◊ Kidney masses formed from focal infection

* Follow-up can be in the form of additional imaging, procedure, or other definitive management.

¶ A pseudotumor is a lesion that can have the appearance of a tumor on ultrasound but can be characterized as a non-tumor structure (eg, column of Bertin, persistent fetal lobulation) by computed tomography or magnetic resonance imaging. Once characterized, pseudotumors do not need additional follow-up.

Δ Solid contrast-enhancing masses need follow-up because some of these can be renal cell carcinomas. Other benign lesions, such as fat-poor angiomyolipoma and oncocytoma, can also have a similar appearance.

◊ Indeterminate lesions include those that are not definitively benign on imaging.

Graphic 131673 Version 5.0

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Lesions that do and do not need follow-up