| 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) |
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| 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) |
| spinal sign | <clinical sign> In pleurisy, the spinal muscles are in a state of tonic contraction on the affected side. (05 Mar 2000) |
| spine sign | <clinical sign> Resistance to flexion of the spine in cases of meningitis. (05 Mar 2000) |
| S sign of Golden | In pulmonary radiology, the combination of an atelectatic lobe and a central obstructing mass produces a concavity and a convexity, like the letter "S." (05 Mar 2000) |
| neck sign | <clinical sign> A physical examination finding that can indicate inflammation of the meninges (meningitis), performed in two forms: passive flexion of one leg results in a similar movement on the opposite side or if the neck is passively flexed, flexion occurs in the legs. (27 Sep 1997) |
| Steinberg thumb sign | <clinical sign> In Marfan's syndrome, when the thumb is held across the palm of the same hand, it projects well beyond the ulnar surface of the hand. (05 Mar 2000) |
| Stellwag's sign | <clinical sign> Infrequent and incomplete blinking in Graves' disease. (05 Mar 2000) |
| Sternberg's sign | <clinical sign> Unilateral tenderness or discomfort on palpation of the shoulder girdle muscles in a patient with pleurisy on that side. (05 Mar 2000) |
| Neri's sign | <clinical sign> In hemiplegia, the knee bends spontaneously when the leg is passively extended. (05 Mar 2000) |
| Stewart-Holmes sign | <clinical sign> In cerebellar disease, the inability to check a movement when passive resistance is suddenly released. Synonym: rebound phenomenon. (05 Mar 2000) |