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Cystic renal cell carcinoma. Imaging findings with pathologic correlation
Y Yamashita1, O Watanabe, T Miyazaki
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Acta Radiologica (Stockholm, Sweden : 1987)
|January 1, 1994
Summary
Radiologic and histologic analysis classified cystic renal cell carcinoma (RCC) into four patterns. Macrocystic multilocular RCC presented as cystic masses, while microcystic variants were irregularly hyperechoic.
Area of Science:
- Radiology
- Pathology
- Oncology
Background:
- Cystic renal cell carcinoma (RCC) encompasses diverse subtypes with varying imaging features.
- Accurate radiologic characterization is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To correlate radiologic findings with histopathologic growth patterns in cystic RCC.
- To differentiate between macrocystic and microcystic multilocular RCC based on imaging.
Main Methods:
- Retrospective analysis of 27 cystic RCCs in 23 patients.
- Correlation of ultrasound, contrast-enhanced CT, and angiography findings with histopathologic classification.
- Classification into multilocular (macrocystic/microcystic), unilocular, cystic necrosis, and tumors arising from simple cysts.
Main Results:
- Macrocystic multilocular RCC: multiloculated on US/CT, peripheral/internal neovascularity on angiography.
- Microcystic multilocular RCC: irregularly hyperechoic on US, minimal enhancement on CT, slight neovascularity on angiography.
- Unilocular RCC: cystic mass with irregular wall/nodules on US/CT.
- Cystic necrosis RCC: varied US/CT appearance, peripheral neovascularity, clinically aggressive.
Conclusions:
- Distinct radiologic features differentiate cystic RCC subtypes.
- Macrocystic multilocular RCC appears cystic, while microcystic variants are less clearly defined on imaging.
- Cystic necrosis RCC exhibits aggressive clinical behavior and peripheral neovascularity.