Extranodal lymphomas of abdomen and pelvis: imaging findings and differential diagnosis.

A wide spectrum of extranodal lymphomas in the abdomen and pelvis is commonly encountered by imaging. Diagnosing these lesions generally requires a multimodality approach. This review highlights imaging appearances of extranodal lymphomas in the abdomen and pelvis with emphasis on computed tomography, magnetic resonance imaging, and positron emission tomography-computed tomography along with the relevant differential diagnosis.

Preoperative evaluation of perinephric fat invasion in patients with renal cell carcinoma: correlation with pathological findings.

The purpose of this study was to evaluate the role of computed tomography (CT) and magnetic resonance imaging (MRI) scans in predicting perinephric fat invasion. Preoperative CT and MRI scans of 109 patients were assessed retrospectively by two radiologists focusing on perinephric fat invasion. Findings were correlated with histopathology. Perinephric fat involvement on imaging was reported in 55 cases, and postoperative pathology record confirmed it in 32 patients. The sensitivity, specificity, positive predictive value, and negative predictive value were 82%, 63%, 48%, and 89%, respectively, with a P value of .001. To conclude, cross-sectional imaging techniques can reliably predict perinephric fat invasion in renal carcinomas preoperatively.