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The Rhombus of Michaelis, also known as the Michaelis-Raute or the quadrilateral of Michaelis, is a rhombus-shaped contour that is sometimes visible on the lower human back. The Rhombus of Michaelis is named after Gustav Adolf Michaelis, a 19th-century German obstetrician.
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Rhombus of Michaelis Wikipedia(Text) CC BY-SA