Letter Sign Name Specialty Associated conditions External link (if no internal link) Descriptor A Aaron sign Charles Dettie Aaron surgery appendicitis epigastric pain with pressure on McBurney's point A Abadie's sign Jean Marie Charles Abadie endocrinology Graves' disease levator palpebrae superioris spasm A Abadie's symptom Joseph Louis Irenée Jean Abadie neurology tabes dorsalis absence of pain on Achilles tendon pressure A Abderhalden reaction Emil Abderhalden obstetrics pregnancy serum reaction;obsolete A Abelin reaction Isaak Abelin infectious disease syphilis presence of arsenical anti-syphilitic;obsolete A Addis count Thomas Addis nephrology pyelonephritis quantitative cells and casts in 24hr. urine A Adie pupil William John Adie neurology ciliary nerve damage dilated pupil, poorly reactive but with normal near accommodation A Adson's sign Alfred Washington Adson vascular surgery thoracic outlet sy...