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Vascular and Lymphatic Neoplasms

»	Which is the most common benign vascular neoplasm of childhood?
»	What are the clinical subtypes of HOI?
»	Name the complications of hemangiomas.
»	What is the most common complication of hemangiomas?
»	Are there any residua of hemangiomas after regression?
»	What is Kasabach-Merritt syndrome?
»	Name the two vascular tumors most commonly associated with the Kasabach-Merritt syndrome.
»	Port wine stains and lymphangiomas are not neoplasms. What are they?
»	What is the difference between a vascular malformation and a vascular neoplasm?
»	What is Klippel-Trénaunay syndrome?
»	How does Klippel-Trénaunay-Weber syndrome differ from Klippel-Trénaunay syndrome?
»	What are blue-black hyperkeratotic vascular papules?
»	Where and in whom are cherry angiomas most commonly seen?
»	Where do you find venous lakes?
»	What is the most common presenting feature of a pyogenic granuloma?
»	Where are you likely to find a lesion of angiolymphoid hyperplasia?
»	What vascular tumor is associated with the Sucquet-Hoyer canal?
»	Matlike telangiectasias on the face, lips, tongue, ears, hands, and feet associated with internal bleeding is known as what syndrome?
»	What is the most common cause of acquired facial telangiectasia?
»	Which benign acquired vascular disease is often initially confused with Kaposi’s sarcoma?
»	What is a cystic hygroma?
»	Name the types of lymphatic malformations.
»	Can you treat deep macrocystic lymphatic malformations?

Which is the most common benign vascular neoplasm of childhood?

Hemangioma of infancy (HOI), which is a benign tumor of capillary endothelium. This tumor typically presents at ages 2 to 8 weeks and then goes through a rapid growth phase for the first 6 to 9 months of life. It then begins to regress, with complete regression in 50% of patients by age 5 years. Regression does not necessarily imply return of the skin to normal.

Kilcline C, Frieden IJ: Infantile hemangiomas: how common are they? A systematic review of the medical literature, Pediatr Dermatol 25:168–173, 2009.