Boas' or Boas's sign is hyperaesthesia (increased or altered sensitivity) below the right scapula can be a symptom in acute cholecystitis (inflammation of the gallbladder). It is one of many signs a medical provider may look for during an abdominal examination.
Its namesake is Ismar Isidor Boas (1858–1938), German physician and first licensed GI specialist in his country.
Boas' sign can also indicate stomach and duodenal disease. When the transverse processes of thoracic vertebrae T10-T12 are pressed or effleuraged with the bottom of the hand, pain can appear at left of spinous processes (in stomach's lesser curvature ulcer) or at right (in pyloric or duodenal ulcer).
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