Pathogenesis of koilonychia is not clear but may be related to reduced iron in iron containing enzymes in epithelial cells or poor blood flow with subsequent weakening and depression of underlying nail-connective tissue. 복부 검진시 빠지지 않는게 손톱. 철분부족 빈혈이랑 나타나는 스푼형 손톱. 코일로니키아 라고 한다 영어로.