“There is no focal infiltrate.”
This statement doesn’t explicitly exclude diffuse or multifocal infiltrate. It’s an example of using more words to say less.
“There is no infiltrate,” excludes focal, multifocal, diffuse, and any other infiltrate.
N.B. Infiltrate is not recommended by the Fleischner Society, and has be replaced by other descriptors. The term opacity, with relevant qualifiers, is preferred.