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Published online before print November 12, 2001, 10.1148/radiol.2213010178
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(Radiology. 2001;221:628-632.)
© RSNA, 2001

Genitourinary Imaging

Rapid MR Imaging Detection of Renal Cysts: Age-based Standards1

Alessandra B. Nascimento, MD, Donald G. Mitchell, MD, Xiao-Ming Zhang, MD, Tamotsu Kamishima, MD, Laurence Parker, PhD and George A. Holland, MD

1 From the Department of Radiology, Thomas Jefferson University Hospital, 132 S 10th St, Suite 1096, Main Bldg, Philadelphia, PA 19107. Received December 18, 2000; revision requested February 5, 2001; revision received February 26; accepted March 23. Address correspondence to D.G.M. (e-mail: donald.mitchell@mail.tju.edu).

PURPOSE: To establish age-based standards for renal cysts depicted at magnetic resonance (MR) imaging and to compare these standards with existing standards for ultrasonography (US).

MATERIALS AND METHODS: Three radiologists reviewed subsecond T2-weighted single-shot fast spin-echo kidney MR imaging findings in 528 patients (248 men, 280 women) selected from consecutive abdominal MR studies without regard to clinical indication. Age, sex, and number and diameter of cysts were noted. Results were analyzed with nonparametric tests and were compared with published US results.

RESULTS: Men (mean, 2.0; 95% CI: 1.5, 2.5) had more renal cysts than women (mean, 1.2; 95% CI: 0.9, 1.5) (P < .001). Number and diameter of cysts increased with age (P < .001). Of 528 patients, 330 (62.5%) had at least one renal cyst, and 315 (59.7%) had cysts of 10 mm or less. MR imaging findings were comparable to published US criteria for type 1 autosomal dominant polycystic kidney disease (ADPKD) if only cysts larger than 1 cm were considered: Only one subject in the group of 18–29-year-old subjects had at least two renal cysts, and five of 493 subjects aged 30–59 years had at least two cysts in each kidney.

CONCLUSION: Compared with reported US results, MR imaging depicted an increased number of simple renal cysts in healthy individuals because of its increased sensitivity for cysts smaller than 1 cm. If only simple renal cysts larger than 1 cm are considered, US criteria for type 1 ADPKD can be applied to MR imaging.

Index terms: Kidney, cysts, 81.311, 81.312 • Kidney, diseases, 81.3121 • Kidney, MR, 81.121411 • Magnetic resonance (MR), comparative studies, 81.1214 • Magnetic resonance (MR), rapid imaging, 81.121411 • Ultrasound (US), comparative studies, 81.1298




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