Dermatology · Vascular Anomalies
The facts most likely to be tested
Infantile hemangiomas typically follow a proliferative phase during the first year of life followed by a slow involuting phase over several years.
The first-line systemic treatment for problematic or high-risk infantile hemangiomas is oral propranolol.
Infantile hemangiomas are GLUT-1 positive vascular tumors, which distinguishes them from other vascular malformations.
Lesions located in the beard distribution (mandibular area) carry a high risk of associated subglottic hemangioma and airway compromise.
Large, segmental facial hemangiomas are associated with PHACE syndrome, which includes posterior fossa malformations, hemangiomas, arterial anomalies, cardiac defects, and eye abnormalities.
Lumbosacral hemangiomas should prompt screening for SACRAL syndrome or spinal dysraphism, including tethered cord and genitourinary anomalies.
Most uncomplicated infantile hemangiomas require no treatment and should be managed with clinical observation and reassurance.
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A 3-month-old infant is brought to the clinic by his mother for a rapidly growing red lesion on his left cheek. The mother notes the lesion was not present at birth but appeared as a small pale spot at 2 weeks of age and has since expanded into a bright red, rubbery, raised plaque. The infant has no difficulty breathing, and physical examination reveals no other cutaneous lesions. The lesion is non-pulsatile and blanches slightly on pressure.
What is the most appropriate management for this patient?
Clinical observation
This patient presents with a classic uncomplicated infantile hemangioma in the proliferative phase; because it is not obstructing vision, the airway, or causing ulceration, observation is the standard of care.
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Etiology / Epidemiology
Most common benign tumor of infancy; female sex, low birth weight, and prematurity are primary risk factors.
Clinical Manifestations
Rapid postnatal proliferation followed by involution; strawberry hemangioma is the pathognomonic appearance.
Diagnosis
Primarily clinical diagnosis; use ultrasound with Doppler to confirm vascular flow if presentation is atypical.
Treatment
Propranolol is the first-line systemic therapy; bradycardia and hypoglycemia are critical monitoring targets.
Prognosis
Most involute by age 5-9 years; complications arise if lesions obstruct vital structures like the airway or eyes.
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Epidemiology & Etiology
Occurs in 5-10% of infants, with a higher incidence in Caucasian populations. Risk increases significantly with advanced maternal age and multiple gestations. It is a neoplasm of endothelial cells, not a vascular malformation.
Pertinent Anatomy
Superficial lesions involve the dermis, while deep lesions involve the subcutaneous tissue. Lesions in the periorbital or laryngeal regions are high-risk due to potential for functional impairment.
Pathophysiology
Characterized by a rapid proliferative phase driven by VEGF and bFGF expression. This is followed by a prolonged involution phase where endothelial cells undergo apoptosis. The process is distinct from malformations as it exhibits true cellular hyperplasia.
Clinical Manifestations
Lesions are typically absent at birth or present as a faint macule. The strawberry hemangioma is a bright red, rubbery, well-demarcated nodule. Red flags include lesions in the 'beard' distribution, which may signal laryngeal hemangioma and airway compromise.
Diagnosis
Diagnosis is clinical based on the characteristic growth pattern. If the diagnosis is uncertain or the lesion is deep, ultrasound is the preferred imaging modality to demonstrate high-flow vascularity. MRI is reserved for complex, deep lesions to assess extent and involvement of underlying structures.
Treatment
Observation is standard for uncomplicated lesions. Propranolol is the first-line systemic treatment for high-risk or disfiguring lesions. Contraindications include asthma, heart block, and history of hypoglycemia. Topical timolol may be used for small, superficial lesions.
Prognosis
Most lesions undergo spontaneous involution, with 50% resolved by age 5 and 90% by age 9. Residual skin changes like telangiectasias or fibrofatty tissue may persist. Ulceration is the most common complication, requiring wound care and pain management.
Differential Diagnosis
Vascular malformation: present at birth and grow proportionally with the child
Pyogenic granuloma: history of minor trauma and prone to bleeding
Kaposiform hemangioendothelioma: associated with Kasabach-Merritt phenomenon
Infantile fibrosarcoma: firm, deep-seated mass requiring biopsy
Dermatofibrosarcoma protuberans: rare, indurated plaque with slow growth