| atypical pneumonia | <chest medicine> This refers to a type of pneumonia that does not follow the typical signs and symptoms of pneumonia. A number of different viral and bacterial agents have been identified which can cause this form of respiratory infection. Examples include Chlamydia pneumonia, psittacosis, Mycoplasma, influenza A or B, adenovirus and Legionella. Antibiotics will be necessary in all but the mildest cases. Symptoms generally improve in less than 2 weeks. (27 Sep 1997) |
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| atypical pseudocholinesterase | A genetic variant of cholinesterase that fails to catalyze the hydrolysis of succinylcholine. See: dibucaine number, fluoride number. (05 Mar 2000) |
| atypical trigeminal neuralgia | Periodic pain in any region of the face, teeth, tongue, and occasionally in the occipital or shoulder area, which lasts several minutes to several days but has no trigger point and lacks the paroxysmal character of tic douloureux. Synonym: atypical facial neuralgia. (05 Mar 2000) |
| atypical verrucous endocarditis | Verrucous endocarditis sometimes associated with disseminated lupus erythematosus. Synonym: atypical verrucous endocarditis, Libman-Sacks syndrome, nonbacterial verrucous endocarditis. (05 Mar 2000) |
| atypism | State of being not typical. Synonym: atypism. (05 Mar 2000) |