en coup de sabre

Etymology
From, so-called because of its resemblance to the scar of a sabre wound.

Adjective

 * 1)  Of a subtype of localised scleroderma, having a linear, atrophic depression on the frontoparietal scalp.

Noun

 * 1)  A subtype of localised scleroderma that presents with a linear, atrophic depression on the frontoparietal scalp.