Renal angiomyolipoma staging criteria proposed by University Medical Center Utrecht

Stage	Number of angiomyolipoma	Angiomyolipoma size	Description of kidney anatomy
None detected*	None ≥1 cm in longest diameter	–	Normal
1	≤5	<3.5 cm	Normal
2	>5	<3.5 cm	Normal
3	≤5	At least 1 ≥3.5 cm	Kidney intact
4	>5	1 to 4 ≥3.5 cm	Kidney intact
5	>5	≥5 ≥3.5 cm	Kidney recognizable
6	>5	At least 1 ≥5 cm	Kidney not recognizable

* Angiomyolipoma not detectable or lesions <1 cm unidentifiable as angiomyolipoma.

Reproduced from: Eijkemans MJ, van der Wal W, Reijnders LJ, et al. Long-term follow-up assessing renal angiomyolipoma treatment patterns, morbidity, and mortality: An observational study in tuberous sclerosis complex patients in the Netherlands. Am J Kidney Dis 2015; 66:638. Table used with the permission of Elsevier Inc. All rights reserved.

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Renal angiomyolipoma staging criteria proposed by University Medical Center Utrecht