๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Spider nevus
Spider nevus
Clinical features Spider nevi are extremely common lesions of little pathological significance.1,2 Although they may arise at any age, they are typically a cutaneous manifestation of chronic liver disease or thyrotoxicosis and may also be seen in pregnancy. The lesions manifest as pinhead-sized, deep red puncta from which tiny tortuous vessels radiate (Fig. 35.454).
Both salmon patch and port-wine stain are characterized solely by ectatic vessels of variable caliber in the dermis; designation as a true hemangioma, therefore, is probably inappropriate (Fig. 35.453).
Fig. 35.453 Port-wine stain: the malformation is characterized by numerous dilated blood-filled capillaries.
Fig. 35.454 Spider nevus: note the central macule with radiating vessels. From the collection of the late N.P. Smith, MD, The Institute of Dermatology, London, UK.