| setting sun sign | <clinical sign> Retraction of the upper lid without upgaze so that the iris seems to "set" below the lower lid; suggestive of neurologic damage in the newborn, but usually clears up without sequelae. See: Collier's sign, Epstein's sign. (05 Mar 2000) |
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| Shibley's sign | <clinical sign> On auscultation of the chest, the spoken sound "e" is heard as "ah" over an area of pulmonary consolidation or immediately above a pleural effusion. (05 Mar 2000) |
| Siegert's sign | <clinical sign> Shortness and inward curvature of the terminal phalanges of the fifth fingers in Down's syndrome. (05 Mar 2000) |
| sign | <clinical sign> An objective physical finding found by the examiner. (27 Sep 1997) |
| sign blindness | Visual agnosia for signs. (05 Mar 2000) |
| sign language | A system of hand gestures used for communication by the deaf or by people speaking different languages. (12 Dec 1998) |
| sign of elongation | <microscopy> Referring to the elongation of a substance in relation to refractive indices. If it is elongated in the direction of the high refractive index, it is said to have a positive sign of elongation. If it is elongated in the direction of the low refractive index, it has a negative sign of elongation, not to be confused with the sign of double refraction (i.e., optic sign). (05 Aug 1998) |
| sign of the orbicularis | In hemiplegia, inability to voluntarily close the eye on the paralysed side except in conjunction with closure of the other eye. Synonym: Revilliod's sign. (05 Mar 2000) |
| Signorelli's sign | <clinical sign> Tenderness on pressure in the glenoid fossa in front of the mastoid process in meningitis. (05 Mar 2000) |
| silhouette sign of Felson | In pulmonary radiology, the obliteration of a normal air-soft tissue interface, such as the cardiac silhouette, when fluid fills the adjacent part of the lung. (05 Mar 2000) |
| Simon's sign | <clinical sign> In incipient meningitis in children, the movements of the diaphragm are dissociated from those of the thorax. (05 Mar 2000) |
| Skoda's sign | A peculiar, high-pitched sound, less musical than that obtained over a cavity, elicited by percussion just above the level of a pleuritic effusion. Synonym: Skoda's sign, Skoda's tympany. (05 Mar 2000) |
| Snellen's sign | <clinical sign> Bruit heard on auscultation over the eye in a patient with Graves' disease, due to the hyperdynamic circulation. (05 Mar 2000) |
| snowman sign | <radiology> Supracardiac TAPVR, (total anomalous pulmonary venous return), return to persistent left superior vena cava, aka: vertical vein (12 Dec 1998) |
| spalding sign | <radiology> Overlapping of foetal skull bones, suggests foetal demise (12 Dec 1998) |