Anatomy and pathology of the nail and subungual space: Imaging evaluation of benign lesions

The lesions of the ungual and subungual space include various etiologies, which may be similar in clinical presentation, almost always with nail deformity. Imaging evaluation is helpful in the characterization of these lesions, narrowing the differential diagnosis and leading to appropriate treatment. This review aims to outline the anatomy and terminology used to describe the alterations of the nail unit and the main imaging characteristics of some of the most common benign lesions of the nail.