title: Congenital and multiple hobnail hemangiomas.
abstract: Hobnail hemangioma (targetoid hemosiderotic hemangioma) is a vascular tumor affecting the limbs or trunk. Characteristically, the lesion has a "targetoid" clinical feature and dilated vascular spaces lined by hobnail endothelial cells at histologic examination. The age of onset is widely variable, form 5~67 years, typically occurring in young or middle-aged persons. It is usually apparent as a small solitary lesion. However, multiple lesions are identified sometimes. Herein, we report two cases of hobnail hemangioma in 7-year-old and 15-year-old males. Of note, the former case had a congenital lesion and the latter, multiple acquired lesions, which are both rare atypical presentations of the disease.
authors.affiliation: Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: So Young
authors.initials: SY
authors.lastname: Yoon
authors.forename: Hyuck Hoon
authors.initials: HH
authors.lastname: Kwon
authors.forename: Hye Chan
authors.initials: HC
authors.lastname: Jeon
authors.forename: Jong Hee
authors.initials: JH
authors.lastname: Lee
authors.forename: Soyun
authors.initials: S
authors.lastname: Cho