Koilonychia (from the Greek: koilos-, hollow, onikh-, nail) (also known as spoon nails:782) is a nail disease that can be a sign of hypochromic anemia, especially iron-deficiency anemia.:656 Koilonychia literally means "spoon nails." It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing.
Koilonychia is associated with Plummer-Vinson syndrome and iron deficiency anemia.
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