๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Acquired elastotic hemangioma
Acquired elastotic hemangioma
Clinical features
Acquired elastotic hemangioma is a rare lesion arising in sun-exposed skin of the forearms and neck, with predilection for middle-aged and elderly women. It presents as a small, solitary, asymptomatic erythematous plaque.1,2
Differential diagnosis The differential diagnosis includes retiform hemangioendothelioma and patch-stage Kaposi sarcoma: the former is diffusely infiltrative and extends into the subcutaneous tissue; the latter lacks a wedge-shaped architecture, does not display hobnail endothelial cells lining the proliferating vascular channels and plasma cells are conspicuous. Furthermore, the endothelial cells lining the vascular channels in Kaposi sarcoma are invariably positive for HHV-8.
Histologic features A band-like superficial dermal proliferation of capillaries, which are often parallel to the epidermis, is seen (Fig. 35.494). In the surrounding, dermis there is solar elastosis. The endothelial cells are positive for vascular markers including CD31 and ERG but are usually negative for D2-40.3
Fig. 35.494 Acquired elastotic hemangioma: (A) there is a superficial plaque-like proliferation of small blood vessels; (B) note the background solar elastosis.