Triangular lunulae in a patient with nail-patella syndrome

A photograph of the pathognomic finding of triangular lunulae in a patient with nail-patella syndrome. The lunula is the visible root of the nail that normally is a crescent-shaped, whitish area at the nail bed, rather than the triangular shape (apex away from the base) shown here and observed in 80 to 90 percent of patients with this syndrome.