Characterization of solid renal masses using 64-slice multidetector CT scanner.

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Accurate characterization of solid renal masses is crucial for appropriate patient management.
• Distinguishing between different types of renal tumors, such as clear cell renal cell carcinoma (RCC) and angiomyolipoma (AML), impacts treatment strategies.

Purpose of the Study:

• To evaluate the utility of a 64-slice multidetector CT (MDCT) scanner in characterizing solid renal masses.
• To assess a simplified method for correcting postenhancement attenuation values in CT imaging of renal masses.

Main Methods:

• A multiphasic CT study was performed on 96 adult patients with renal masses, including pre- and postcontrast scans (corticomedullary and nephrographic phases).
• Postcontrast attenuation values at the corticomedullary phase were corrected using a simplified approach.
• Histopathological data (postbiopsy or postsurgical) served as the reference standard for diagnosis.

Main Results:

• The study analyzed 96 solid renal masses, including various subtypes of RCC, angiomyolipoma (AML), and oncocytoma.
• Angiomyolipomas (AML) were identified by the presence of fat with low attenuation values (< -40 HU) on nonenhanced scans.
• After correction, the clear cell type of RCC was accurately differentiated with high specificity (92%), sensitivity (84%), and overall accuracy (93%) at the postcontrast corticomedullary phase.

Conclusions:

• A 64-slice MDCT scanner, combined with corrected enhancement values, enables reliable diagnosis of clear cell renal cell carcinoma (RCC).
• The presence of fat on precontrast scans facilitates the easy identification of angiomyolipomas (AML).