When i use a word... Medical slang: Acronyms and backronyms

Medical terminology and slang contain many abbreviations, of which acronyms and backronyms are varieties. There are many acronymic forms according to pronunciation and formation. Regarding pronunciation, there are acronyms that form real words; acronyms that resemble incorrectly spelt real words; and acronyms that can be pronounced as if they were real words but aren't. Regarding formation, some acronyms are formed solely from the first letters of the words they represent; acronyms that use more than one letter from the start of some of the words they represent; and acronyms that can include letters from anywhere in the words they represent. In some cases some of the words whose initials should be part of the acronym are ignored. Backronyms are of two types: those that are formed with a specific set of words in mind, choosing the words to fit the acronym; and those that incorrectly explain the origin of a word by attributing an explanatory etymology derived from its initial letters.