Pathology as a medical specialty is the branch of medicine that deals with the study of diseases and the morphologic, physiologic changes produced by them.

作为一种医专业是涉及疾的研究和它们生的形态，生变化的医分支。

The scale goes from I to IV based on the morphologic and functional features of the tumor cells; a grade IV tumor being the most abnormal looking cells that also tend to be the most aggressive.

基于胞的形态和功能特征，分为从I级到IV级；胞形态最为异常的IV级也往往最有侵袭性。