Evaluation of Crohn's disease activity by MR enterography: Derivation and histopathological comparison of an MR-based activity index.

Aims: To compose a qualitative magnetic resonance imaging (MRI) activity index showing Crohn disease (CD) activity, and to compare magnetic resonance enterography (MRE) findings with histopathology results.

Materials And Methods: Twenty-six patients (11 male and 15 female; mean age 36.7) who had MRE and colonoscopic biopsy between October 2011 and August 2012 were included in the study.

Primary synovial sarcoma of the kidney.

Synovial Sarcoma (SS) is a soft tissue neoplasm that occurs generally in the proximity of large joints. Here, we report a case of a 45-year-old man who was diagnosed with Primary SS of the kidney which is an extremely rare tumor that accounts for less than 2% of malignant renal tumors. We also review the literature on primary synovial sarcomas of the kidney and focus especially on the renal tumors' differential diagnosis.