Boas' point
Encyclopedia
Boas' point is an area of tenderness to palpation
Palpation
Palpation is used as part of a physical examination in which an object is felt to determine its size, shape, firmness, or location...

 to the left of the 12th thoracic vertebra found in some patients with gastric ulcer
Peptic ulcer
A peptic ulcer, also known as PUD or peptic ulcer disease, is the most common ulcer of an area of the gastrointestinal tract that is usually acidic and thus extremely painful. It is defined as mucosal erosions equal to or greater than 0.5 cm...

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This medical sign
Medical sign
A medical sign is an objective indication of some medical fact or characteristic that may be detected by a physician during a physical examination of a patient....

 is named after Ismar Isidor Boas
Ismar Isidor Boas
Ismar Isidor Boas was a German gastroenterologist who was born in the town of Exin. He studied medicine in Berlin, Halle and Leipzig, and subsequently became an assistant to Carl Anton Ewald at the Augusta Hospital in Berlin...

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