Rosenstein's sign, also known as Sitkovskiy sign, is a sign of acute appendicitis.
It is observed when tenderness in the right lower quadrant increases when the patient moves from the supine position to a recumbent posture on the left side.Diagnosis and Treatment of Acute Appendicitis JMAJ 46(5): 217–221, 2003 Hiroshi ISHIKAWA
Etymology The sign is named after the almost forgotten Jewish German physician and director of The Jewish Hospital, Berlin, Paul Rosenstein (1875–1964). Sitkovskiy's symptom is the equivalent symptom.
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