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The International Society of the Study of Vascular Anomalies
(ISSVA) divided vascular anomalies into malformations or tumors,
and the vast majority of vascular lesions can be classified using
this schema (Table 364-1). Vascular tumors
and malformations can usually be distinguished from one another based
on clinical appearance and growth characteristics (Table
364-2). If diagnosis is unclear observation over time, imaging
studies or even biopsy may be required.
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Clinical Manifestations
and Subtypes
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The most common vascular tumor is infantile hemangioma (IH), present
in approximately 4% of infants and more common in females,
Caucasians, preterm infants (particularly in those weighing < 1500
g) and infants of multiple gestations.2 A key clinical
feature is whether hemangiomas are localized (eg,
arising as a nodule or small area ...