The National Toxicology Program (NTP) classification system for rat and mouse ovarian tumors is presented. The classification system is based on previous classification systems and on a review of all the primary ovarian tumors from the archives of the National Cancer Institute (NCI) and NTP Carcinogenesis Testing Programs. The relative frequency and principal diagnostic features of 204 ovarian ...

With the increasing use of ultrasonography, renal incidentaloma cases have also been rising. A solid mass observed incidentally will either be malignant or benign. Of tumors, cell carcinoma (RCC) is most common. The two common benign tumors that need to differentiated from RCC are oncocytoma and angiomyolipoma. It difficult differentiate on ultrasonography. Furthermore, there difficulties disti...