|Classification and external resources|
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 " 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. In early stages nails may be brittle and chip or break easily.
Koilonychia is associated with Plummer-Vinson syndrome and iron deficiency anemia.
- James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
- Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
- Kumar, Robbins and Cotran: Pathologic Basis of Disease, 7th ed., 2005. Saunders.
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