| optic sign | <microscopy> For uniaxial materials, by definition, the sign is positive if the value epsilon minus omega is positive, and negative if epsilon - omega is negative. For biaxial materials, the sign is positive if gamma is the acute bisectrix, and negative if alpha is the acute bisectrix, or positive if gamma - beta greater than beta - alpha and negative if gamma - beta less than beta - alpha (05 Aug 1998) |
|---|---|
| Osler's sign | <clinical sign> In acute bacterial endocarditis, circumscribed painful erythematous swellings, ranging in size from that of a pinhead to that of a pea, in the skin and subcutaneous tissues of the hands and feet. (05 Mar 2000) |
| ten Horn's sign | <clinical sign> Pain caused by gentle traction on the right spermatic cord, indicative of appendicitis. (05 Mar 2000) |
| terry thomas sign | <radiology> A gap between the scaphoid and the lunate bones suggesting a rupture of the scapho-lunate ligament (12 Dec 1998) |
| Thomson's sign | <clinical sign> The presence of pink or red transverse lines at the bend of the elbow in the preeruptive stage of scarlatina; they persist through the eruptive stage and remain as pigmented lines after desquamation. Synonym: Thomson's sign. (05 Mar 2000) |
| Ebstein's sign | <clinical sign> In pericardial effusion, obtuseness of the cardiohepatic angle on percussion. Sign of oedema of lower eyelid, swelling of the lower lid found in congestive failure, myxoedema, or nephrosis. (05 Mar 2000) |
| tinel's sign | <clinical sign> A physical exam finding indicating carpal tunnel syndrome. Electric shock-like pains are appreciated when the examiner taps lightly on the underside of the wrist, over the median nerve. (27 Sep 1997) |
| Toma's sign | <clinical sign> To distinguish between inflammatory and noninflammatory ascites: in inflammatory conditions of the peritoneum, the mesentery contracts, drawing the intestines over to the right side; consequently, when the patient lies on his back, tympany is elicited on the right side, dullness on the left. (05 Mar 2000) |
| Topolanski's sign | <clinical sign> Congestion of the pericorneal region of the eye in Graves' disease. (05 Mar 2000) |
| Tournay sign | Dilation of the pupil in the abducting eye on extreme lateral gaze. This is present in only a small percentage of the normal popupation and has no known association with disease. Synonym: Tournay sign. (05 Mar 2000) |
| Traube's sign | <clinical sign> A double sound or murmur heard in auscultation over arteries (particularly the femoral arteries) in significant aortic regurgitation. (05 Mar 2000) |
| Trelat's sign | <clinical sign> An obsolete sign; the presence of disseminated yellowish spots in the neighborhood of tuberculous ulcers of the mouth; they are minute tubercles or miliary abscesses. (05 Mar 2000) |
| Trendelenburg's sign | <clinical sign> In congenital dislocation of the hip or in hip abductor weakness, the pelvis will sag on the side opposite to the dislocation when the hip and knee of the normal side is flexed; without dislocation or weakness, the pelvis will rise on the side of the flexed hip and knee. (05 Mar 2000) |
| Tresilian's sign | <clinical sign> A reddish prominence at the orifice of Stenson's duct, noted in mumps. (05 Mar 2000) |
| epicardial fat sign | <radiology> Two lucent lines on lateral CXR anterior to heart, subepicardial fat around LAD, anterior mediastinal fat, lines seen in 40% of all lateral CXRs, if separation greater than 2 mm most likely to be consider pericardial effusion or thickening (12 Dec 1998) |