What is the difference between a legion and a tumor?

Not much,,,: There is not much difference between a lesion and a tumor. That is a reason wh7y these terms are often used interchangeably. A difference, if there is one, is that a lesion is something that can be a tumor, a pocket of infection like an abscess, or a skin abnormality like a papule. A tumor is a swelling or mass and is used to describe a benign or malignant neoplasm or growth.

Not sure = lesion: Common doctor jargon is when you see something abnormal and you are not sure what it is yet you call it a lesion. Once you do know, you call it what it is. (tumor, abscess, lymphnode etc) i hope this helps.

Spectrum of changes: When one uses the term lesion they refer to an abnormality that has grossly occurred in an area of of specific tissue or organ abnormalities. There can be ulceration in the mouth, Without bx one says there is a lesion of oral cavity to be defined which is inflammatory or neoplastic . The term tumor increases the specificity of the dx to one of a malignant or benign process.