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Multilocular cystic renal cell carcinoma presenting as a solid mass: radiologic evaluation
Y Yamashita1, T Miyazaki, A Ishii
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Abdominal Imaging
|March 1, 1995
Summary
Radiologic appearances of small multilocular cystic renal cell carcinomas (MCRCCs) differ from larger ones. These smaller MCRCCs often appear solid on imaging, with minimal contrast enhancement, challenging prior diagnostic criteria.
Area of Science:
- Radiology
- Oncology
- Pathology
Background:
- Multilocular cystic renal cell carcinomas (MCRCCs) are a distinct subtype of renal cell carcinoma.
- Previous radiologic criteria for MCRCCs were based on larger tumors.
- Smaller MCRCCs may not conform to established imaging characteristics.
Purpose of the Study:
- To analyze the radiologic characteristics of smaller MCRCCs.
- To correlate imaging findings with pathological features.
- To understand diagnostic challenges posed by small MCRCCs.
Main Methods:
- Retrospective analysis of radiologic findings in 13 MCRCCs (10-32 mm diameter) from nine patients.
- Correlation of imaging data (US, CT, MRI, angiography) with pathological findings.
Main Results:
- On ultrasound, MCRCCs were typically hyperechoic.
- CT and MRI showed variable density and high signal intensity, often due to hemorrhage or proteinaceous fluid.
- Contrast enhancement and neovascularity were minimal across all imaging modalities.
Conclusions:
- Small MCRCCs (<32 mm) often present as solid masses on imaging, unlike larger counterparts.
- Pathological multilocularity may not be evident radiologically in smaller tumors.
- Subtle contrast enhancement and lack of neovascularity are key imaging features.