Residency · Residency · Otolaryngology
Vascular Anomalies of the Head and Neck in Children
Introduction
Vascular anomalies of the head and neck represent a diverse group of lesions that are among the most common congenital abnormalities encountered in pediatric otolaryngology. The International Society for the Study of Vascular Anomalies (ISSVA) classification system divides these lesions into two major categories: vascular tumors and vascular malformations. Accurate diagnosis is essential, as management strategies differ significantly between categories.
Classification
ISSVA Classification System
Vascular tumors: Lesions characterized by endothelial cell proliferation. Infantile hemangioma (most common vascular tumor of infancy). Congenital hemangioma (rapidly involuting [RICH] and non-involuting [NICH]). Kaposiform hemangioendothelioma. Tufted angioma. Vascular malformations: Structural anomalies of blood vessels without proliferation. Capillary malformations (port-wine stains). Venous malformations. Lymphatic malformations (macrocystic, microcystic, mixed). Arteriovenous malformations (AVMs). Combined malformations.
Key Distinguishing Features
| Feature | Vascular Tumors | Vascular Malformations |
|---|---|---|
| Present at birth | No (appear in first weeks) | Always present at birth |
| Growth pattern | Proliferative phase then involution | Proportional with child; never involute |
| GLUT-1 | Positive (infantile hemangioma) | Negative |
| Endothelial proliferation | Yes | No (structural anomaly) |
| Sex predominance | Female (3:1) | Equal |
Vascular tumors are not present at birth (or minimally so) and undergo a proliferative phase. Vascular malformations are always present at birth, grow proportionally with the child, and never involute spontaneously. GLUT-1 positivity is pathognomonic for infantile hemangioma.
Infantile Hemangiomas
Natural History
Appear within the first weeks of life. Proliferative phase: Rapid growth during months 1-9. Involuting phase: Gradual regression over years 1-5. Involuted phase: Completed by age 5-10; may leave residual fibrofatty tissue or telangiectasia. Up to 60% of head and neck hemangiomas occur in the parotid region.
Indications for Treatment
Airway compromise (subglottic hemangioma), Visual obstruction or amblyopia risk, Ulceration, bleeding, or infection, Significant cosmetic deformity.
Medical Management
Propranolol is first-line systemic therapy (dose: 2-3 mg/kg/day divided BID-TID). Topical timolol for superficial, small lesions. Systemic corticosteroids as second-line therapy. Monitor heart rate, blood pressure, and blood glucose during propranolol initiation.
Vascular Malformations
Lymphatic Malformations
Previously called cystic hygromas or lymphangiomas. Most common in the posterior triangle of the neck. Macrocystic lesions respond well to sclerotherapy (OK-432, doxycycline, bleomycin). Microcystic lesions are more difficult to treat and often require surgical excision. MRI is the imaging modality of choice; T2-weighted images show hyperintense cystic spaces.
Venous Malformations
Soft, compressible, blue-tinged masses that enlarge with Valsalva or dependent positioning. Phleboliths may be visible on imaging. Treatment options include sclerotherapy (sodium tetradecyl sulfate, ethanol) and surgical excision. Frequently recur after incomplete excision.
Arteriovenous Malformations
High-flow lesions with direct arteriovenous shunting. Staged according to the Schobinger classification (stages I-IV). May remain quiescent for years then expand rapidly after trauma, puberty, or pregnancy. Treatment requires preoperative embolization followed by complete surgical resection within 24-48 hours.
Diagnostic Workup
Ultrasound with Doppler: First-line imaging to distinguish high-flow from low-flow lesions. MRI with gadolinium: Gold standard for characterizing extent and tissue planes. CT angiography: Useful for AVMs to delineate feeding vessels. Biopsy: Rarely needed; reserved for atypical presentations or suspected malignancy. GLUT-1 immunostaining: Differentiates infantile hemangioma from other vascular tumors.
Surgical Considerations
Complete excision is curative but not always feasible due to infiltrative nature. Staged excision may be necessary for extensive malformations. Preoperative embolization reduces intraoperative blood loss for high-flow lesions. Airway hemangiomas may require open excision or CO2 laser ablation if refractory to propranolol. Multidisciplinary team approach (otolaryngology, interventional radiology, dermatology, plastic surgery) is recommended.
Key Clinical Pearls
Always classify vascular anomalies using the ISSVA system; avoid outdated terminology such as "cavernous hemangioma". Propranolol has revolutionized the management of infantile hemangiomas and should be initiated early during the proliferative phase. GLUT-1 positivity is the single most reliable marker distinguishing infantile hemangioma from vascular malformations. Segmental facial hemangiomas warrant evaluation for PHACE syndrome (posterior fossa anomalies, hemangioma, arterial anomalies, coarctation, eye abnormalities). Macrocystic lymphatic malformations respond well to sclerotherapy; microcystic lesions often require surgery.
References
- Drolet BA, Frommelt PC, Chamlin SL, et al. Initiation and use of propranolol for infantile hemangioma: report of a consensus conference. Pediatrics. 2013;131(1):128-140.
- Wassef M, Blei F, Adams D, et al. Vascular anomalies classification: recommendations from the International Society for the Study of Vascular Anomalies. Pediatrics. 2015;136(1):e203-e214.
- Perkins JA, Manning SC, Tempero RM, et al. Lymphatic malformations: review of current treatment. Otolaryngol Head Neck Surg. 2010;142(6):795-803.
- Richter GT, Friedman AB. Hemangiomas and vascular malformations: current theory and management. Int J Pediatr. 2012;2012:645678.