Seborrheic kertaosis

Dermoscopy. Seborrheic keratosis and

networklike structures

F. Peral Rubio, M.D.Department of DermatologyHospital Universitario Virgen MacarenaSeville, Spain

Dermoscopy. Seborrheic keratosis and networklike structures

A 65-years-old men. The patient was referred to us for

the assessment of a lesion on the head 10 years previously.

Dermoscopy. Seborrheic keratosis and networklike structures

Dermoscopy shows: Sharply demarcated lesion with a

moth-eaten border. Networklike structures. Irregular crypts (brain - like

appearance with fissures and ridges).

Sharply demarcated

Networklike structures

Networklike structures

Irregular crypts

Sharply demarcated

Dermoscopy. Seborrheic keratosis and networklike structures

Networklike structures This structure did not correspond to the classic

"pigment network" of melanocytic lesions but resembled them.

The lines of these structures are often hyperpigmented and may end abruptly at the periphery.

The grids of these "networklike structures" are much larger than the one seen in a typical pigment network and the holes do not always correspond to the tips of the dermal papillae, but to keratin-filled structures (fissures, comedolike).

Dermoscopy. Seborrheic keratosis and

networklike structures

F. Peral Rubio, M.D.Department of DermatologyHospital Universitario Virgen MacarenaSeville, Spain