“…1 John Carnett, a Philadelphia surgeon, recognized the diagnostic problems posed by abdominal wall lesions and developed a simple test that accurately localizes the origin of symptoms to the abdominal wall. 19 The 20 If the cause of symptoms is intra-abdominal, the tensed muscles protect the viscera and the tenderness diminishes. In contrast, if the pain originates in the abdominal wall, the tenderness increases or remains unchanged, known as the Carnett sign.…”