Infantile laryngeal hemangioma is the most common vascular tumor of the subglottic region in infants. It accounts for 1.5% of all congenital laryngeal anomalies but holds an important place among lesions mimicking subglottic stenosis. It is absent or minimal at birth, entering rapid proliferation between 6 weeks-6 months of age; endothelial cell proliferation is characterized by GLUT-1 positivity. Growth reaches a plateau around 1 year and undergoes spontaneous involution by 2-5 years (replaced by fatty-fibrous tissue). Left posterolateral location in the subglottic region is most common. Cutaneous hemangiomas coexist in 50% of cases; 'beard' distribution (mandibular dermatome) in particular shows strong correlation with subglottic hemangioma. Stridor and airway obstruction are the main clinical concerns. Since the propranolol treatment revolution, the need for invasive intervention has significantly decreased.
Age Range
0-5
Peak Age
1
Gender
Equal
Prevalence
Uncommon
Infantile hemangiomas are benign vascular tumors characterized by endothelial cell proliferation. Pathogenesis progresses through three phases: 1) Proliferation phase (0-12 months): Vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) are expressed at high levels, endothelial cells proliferate rapidly, and new vascular structures form. GLUT-1 (glucose transporter protein-1) is positive in hemangioma endothelium and is the distinguishing histopathologic marker from other vascular anomalies. 2) Plateau phase (12-18 months): Proliferation and apoptosis reach equilibrium, growth stops. 3) Involution phase (2-5 years): Endothelial cell apoptosis becomes dominant, vascular structures regress and are replaced by fatty-fibrous tissue. On imaging, intense enhancement during the proliferation phase reflects hypervascularity of vascular structures — contrast rapidly distributes through numerous newly formed capillaries and arterioles. During the involution phase, fatty infiltration appears as T1 hyperintense areas on MRI, and enhancement decreases. The frequency of subglottic location is related to the embryologic vascular development pattern of this region; left posterolateral predominance corresponds to the distribution area of the left posterior cricoid artery.
In an infant, intensely homogeneously enhancing asymmetric soft tissue mass in the subglottic region + associated cutaneous hemangioma (especially beard distribution) — this combination confirms diagnosis, biopsy is not needed.
On contrast-enhanced CT, intense homogeneous enhancement is seen as asymmetric soft tissue thickening/mass in the subglottic region (usually left posterolateral). The lesion enhances significantly more than surrounding muscle. Airway lumen narrowing accompanies. No calcification and no bone destruction is expected.
Report Sentence
Intensely homogeneously enhancing soft tissue thickening in the left posterolateral subglottic region is seen, consistent with infantile subglottic hemangioma.
On MRI, the subglottic mass is T2 hyperintense (high water content of vascular structures), T1 isointense-mildly hyperintense. Flow voids (signal voids on T1 and T2) may be seen in large lesions during the proliferation phase — reflecting high-flow large vessels. Shows intense homogeneous enhancement. During involution phase, fatty infiltration develops: T1 hyperintense (fat signal) areas appear and enhancement decreases.
Report Sentence
A T2 hyperintense, intensely enhancing asymmetric soft tissue mass is seen in the subglottic region, consistent with infantile hemangioma in the proliferation phase.
Neck US may show a hypervascular solid lesion in the subglottic region. Markedly increased vascularity on Doppler — low-resistance arterial flow and dense venous flow. Assessment of associated cutaneous hemangiomas is also performed. US can be used as a non-invasive follow-up tool for monitoring treatment response.
Report Sentence
On neck US, a solid lesion with markedly increased vascularity is seen in the subglottic region, consistent with infantile hemangioma.
During the involution phase (2-5 years), T1 MRI shows development of hyperintense (fat signal) areas within the hemangioma — reflecting replacement of vascular structures by fatty-fibrous tissue. Lesion size decreases, enhancement diminishes, and Doppler vascularity drops. After complete involution, minimal residual fatty tissue may remain.
Report Sentence
T1 hyperintense areas have developed in the subglottic lesion, with fatty changes consistent with the involution phase.
On non-contrast CT, asymmetric soft tissue thickening and airway lumen narrowing are seen in the subglottic region. Unlike concentric narrowing, asymmetric (left posterolateral) thickening is characteristic of hemangioma. While the normal subglottic airway is symmetrically round, one side is markedly thickened in hemangioma.
Report Sentence
Asymmetric soft tissue thickening and airway narrowing is seen in the left posterolateral subglottic region.
Criteria
Rapid growth period, GLUT-1 positive endothelial proliferation
Distinct Features
Intense enhancement, T2 hyperintense, high Doppler vascularity, rapid growth, highest airway obstruction risk
Criteria
Slow regression, vascular structures replaced by fatty-fibrous tissue
Distinct Features
Size decrease, enhancement reduction, T1 fat signal (hyperintensity), Doppler vascularity decrease
Criteria
Large segmental cutaneous hemangioma + subglottic hemangioma + systemic anomalies
Distinct Features
Posterior fossa anomalies, arterial anomalies, cardiac defects, eye anomalies, sternal cleft — associated with large facial hemangioma
Distinguishing Feature
Papillomatosis irregular mucosal thickening, moderate enhancement, usually glottic; hemangioma asymmetric subglottic mass, intense enhancement, infant
Distinguishing Feature
SCC adult, irregular enhancing mass, cartilage invasion; hemangioma infant, homogeneous intense enhancement, no cartilage invasion
Distinguishing Feature
Laryngocele cystic/air-filled, no enhancement; hemangioma solid, intense enhancement
Urgency
urgentManagement
medicalBiopsy
Not NeededFollow-up
3-monthPropranolol (2 mg/kg/day) is first-line treatment (85-95% response rate). Treatment is usually maintained for 12-18 months. Biopsy is not needed — clinical and radiologic findings are sufficient for diagnosis. In rare cases, steroids, vincristine, or surgical excision (CO2 laser) may be needed. Airway safety is the priority; intubation/tracheotomy may be needed in acute obstruction.
Infantile subglottic hemangioma was a serious airway pathology requiring tracheotomy or open surgery before propranolol therapy. Propranolol (2 mg/kg/day) revolutionized first-line treatment; it shrinks the lesion and secures the airway with an 85-95% response rate. Treatment is usually maintained for 12-18 months. In rare cases, steroids, vincristine, or surgical excision may be needed. Despite expected spontaneous involution, active treatment is required due to airway obstruction risk.