| Abbreviations | Meaning |
 | RBAS | Rostral Basilar Artery Syndrome |
| TIA | Topical Irritation Arthritis; Tracheoinnominate Artery; Transient Ischemic Attack; Tumor-induced Angiogenesis; Turbidimetric Immunoassay |
| OAT | O-acetyltransferase; Ochanomizu Aspirin Trial; Open Artery Trial; Organic Anion Transporter; Ornithine Aminotransferase |
| ICA | Immunocytochemical Analysis; Independent Component Analysis; Internal Carotid Artery; Intracranial Aneurysm; Islet Cell Antibody |
| ACX | Anomalous Circumflex [coronary Artery] |
| LIMA | Left Internal Mammary Artery |
| ART | Artery, Arterial; Articulation; Artificial |
| OCAD | Occlusive Carotid Artery Disease |
| BICAT | Bilateral Carotid Artery Traction |
| CAB | Captive Air Bubble; Cellulose Acetate Butyrate; Coronary Artery Bypass |
| OA | Ophthalmic Artery |
| ECA | External Carotid Artery |
| RSA | Right Subclavian Artery |
| ACA | Abnormal Coronary Artery |
| SIEA | Superficial Inferior Epigastric Artery |
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