| Abbreviations | Meaning |
 | PIAVA | Polydactyly-imperforate Anus-vertebral Anomalies [syndrome] |
| COA | Canadian Ophthalmological Association; Canadian Orthopaedic Association; Certificate Of Authority; Cervico-oculo-acusticus [syndrome]; Condition On Admission |
| CSF | Cancer Family Syndrome |
| ACS | Acrocallosal Syndrome |
| ATCS | Anterior Tibial Compartment Syndrome |
| AMS | Ablepharon-microstomia Syndrome; Accelerator Mass Spectrometry; Act Management System; Acute Mountain Sickness; Adenosylmethionine Synthetase |
| PRTS | Partington Syndrome |
| AAS | Aarskog-Scott [syndrome]; Acid Aspiration Syndrome; Alcoholic Abstinence Syndrome; American Academy Of Sanitarians |
| MRXS | Mental Retardation, X-linked, Syndrome |
| EVC, EVC | Ellis-van Creveld [syndrome] |
| CJS | Creutzfeldt-Jakob Syndrome |
| PVNPS | Post-Viet Nam Psychiatric Syndrome |
| CLH | Chronic Lobular Hepatitis; Cleft Limb-heart [syndrome]; Corpus Luteum Hormone; Cutaneous Lymphoid Hyperplasia |
| OHS | Occipital Horn Syndrome |
| PGAS | Persisting Galactorrhea-amenorrhea Syndrome; Polyglandular Autoimmune Syndrome |
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