Fig. 3

Nail ultrasonography. a Grayscale longitudinal plane ultrasonography and Doppler ultrasonography of the nail apparatus of the right hand fifth finger characteristic of phase III psoriatic onychopathy. The image shows wavy appearance with thickening of the nail plates, the nail bed shows focal hyperechoic involvement and thickening. The matrix does not have any changes. The nail vascularization is normal, as shown in the Doppler exploration. b Grayscale longitudinal plane ultrasonography and Doppler ultrasonography of the nail apparatus of the left hand fifth finger showing signs of early-stage phase I psoriatic onychopathy. The nail plates have normal morphology with hyperechogenic foci below the distal third of the ventral plate (****). The nail bed, matrix, and distal interphalangeal joint are normal