Which condition describes nails that are splayed outwards with a depression in the middle?

Koilonychia is the condition characterized by nails that are splayed outwards with a depression in the middle, often referred to as scoop-shaped nails. This condition can be indicative of various underlying health issues, including iron deficiency anemia. The thumb and index fingers are typically affected, but it can occur in other nails as well. This unique shape is what distinguishes koilonychia from other nail conditions.

Other conditions listed, such as onychorrhexis, refer to nails that exhibit longitudinal ridges and are often brittle, while tinea unguium is a fungal infection that causes nails to become discolored, thickened, and possibly crumble. Leuconychia presents as white spots or lines on the nails, which do not share the same structural alterations that define koilonychia. Understanding these differences helps in accurately identifying and diagnosing nail conditions based on their specific characteristics.