"fluid signal in the middle ear cavity and mastoid antrum."
Line 44:65·Do not put full stops at the end of a list item.
Oxford Comma
suggestion
"adhesive otitis media: retracted tympanic membrane with adhesions to medial wall of tympanic cavity, with or without perforation (sometimes classified as form of chronic otitis media)"
Line 7:111·Use the Oxford comma in 'cavity, with or without'.