| Homans' sign | <clinical sign> Slight pain at the back of the knee or calf when the ankle is slowly and gently dorsiflexed (with the knee bent), indicative of incipient or established thrombosis in the veins of the leg. (05 Mar 2000) |
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| Seidel's sign | <clinical sign> A sickle-shaped scotoma appearing as an upward or downward extension of the blind spot. (05 Mar 2000) |
| Hoover's sign | <clinical sign> The patient is asked to lie supine on a couch, and when asked to raise one leg, they involuntarily make counter pressure with the heel of the other leg. If this leg is paralysed, whatever muscular power is preserved in it will be exerted in this way, or if the patient attempts to lift a paralysed leg, counter pressure will be made with the other heel, whether any movement occurs in the paralysed limb or not. This sign is not present in hysteria or malingering, a modification in the movement of the costal margins during respiration, caused by a flattening of the diaphragm, suggestive of empyema or other intrathoracic condition causing a change in the contour of the diaphragm. (05 Mar 2000) |
| sentinel loop sign | In gastrointestinal radiology, dilatation of a segment of large or small intestine, indicative of localised ileus from nearby inflammation. (05 Mar 2000) |
| Hueter's sign | <clinical sign> In a case of fracture, the vibration expected on tapping the bone is not transmitted when tissue intervenes between the fractured parts of bone. (05 Mar 2000) |
| pyramid sign | <clinical sign> Any of the symptoms indicating a morbid condition of the pyramidal tracts, such as the Babinski or Gordon sign, spastic spinal paralysis, foot clonus, etc. (05 Mar 2000) |
| 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) |
| 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) |