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Renal angiomyolipoma with minimal fat
Yukinari Hosokawa1, Toshiaki Kinouchi, Yuka Sawai
1Department of Urology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
International Journal of Clinical Oncology
|May 23, 2002
Summary
Diagnosing angiomyolipoma with minimal fat can be challenging. Careful review of imaging, including thin-section computed tomography (CT), is crucial for identifying these rare renal tumors.
Area of Science:
- Nephrology
- Radiology
- Oncology
Background:
- Angiomyolipomas (AMLs) are benign renal tumors. AMLs with minimal fat can mimic renal cell carcinoma (RCC) on imaging.
- Accurate diagnosis of renal tumors is essential for appropriate treatment planning.
Observation:
- Two patients presented with renal tumors initially diagnosed as RCC based on imaging.
- Tumors were hyperattenuated on unenhanced CT, moderately enhanced on contrast-enhanced CT, and lacked obvious fat components.
- Advanced imaging revealed specific characteristics, including T2-hypointensity and early enhancement on MRI, and pulsatile vessels on Doppler ultrasound.
Findings:
- The observed imaging features raised suspicion for angiomyolipoma with minimal fat.
- These findings highlight the difficulty in differentiating minimal-fat AMLs from RCC using standard imaging protocols.
Implications:
- Emphasizes the need for meticulous evaluation of imaging characteristics suggestive of minimal-fat AML.
- Recommends thin-section unenhanced CT for detecting subtle fat components when AML is suspected.
- Highlights the importance of integrating multiple imaging modalities for accurate renal tumor diagnosis.