title: Head and neck hemangiomas of infancy.
abstract: OBJECTIVE
  Hemangiomas are the most common benign tumor in infancy, affecting approximately 10% of infants. More than half of hemangiomas involve the head and neck. Increased understanding of hemangiomas has come about from identification of immunohistochemical markers, developmental defects associated with certain hemangiomas, and morphologic and classification schemes (focal versus segmental).
  
  
  RESULTS
  Immunohistochemical markers have been identified which are specific to hemangiomas in all phases of development and involution. Morphologic subtypes and anatomic locations have been identified that place an infant at higher risk for complications from the hemangioma. Hemangiomas associated with other developmental anomalies have been identified, which help guide the treating physician to tease out which infants will need more complete systemic investigations or imaging. Importantly for surgeons, studies have continued to identify which lesions may benefit from early intervention, either surgical or medical.
  
  
  CONCLUSIONS
  While full understanding of the mechanisms that turn on and turn off hemangiomas of infancy is not complete, progress has been made in identification of markers, subtypes at increased risk for complications, and in treatment. With continued work in these areas, we have increased knowledge of treatment options, optimal timing of surgical intervention, and ultimately, preventive options.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Oregon Health and Science University, Portland, Oregon 97239, USA. macarthc@ohsu.edu
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Macarthur
mesh_terms: D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000628:therapy*; D006391:Hemangioma / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D007223:Infant