| A. a. | A. actinomycetemcomitans |
|---|---|
| A.A. | Alcoholic Anonymous |
| A.A. | Alopecia areata |
| A.C.A. | anterior cerebral arteries |
| A.D. | Aortic Dissection |
| A.E.D. | anhidrotic ectodermal dysplasia |
| A.E.P. | Appropriateness Evaluation Protocol |
| A.f. | Aspergillus fumigatus |
| A.G.C. | Advanced Gastric Cancer |
| A.I. | aortic incompetence |