Rare infantile hemangioma

Rare infantile hemangioma refers to uncommon variants or presentations of infantile hemangiomas (IH) — benign vascular tumors composed of proliferating endothelial cells that typically appear shortly after birth. While common infantile hemangiomas affect approximately 4-5% of infants, the designation 'rare infantile hemangioma' under Orphanet (ORPHA:210589) encompasses atypical forms that may include unusual locations, morphologies, or complications that distinguish them from typical superficial or uncomplicated hemangiomas. These rare presentations may involve deep or visceral structures, segmental distributions, or multifocal disease. Infantile hemangiomas characteristically undergo a proliferative phase during the first weeks to months of life, followed by a slow involution phase that can last several years. Rare forms may affect the skin, subcutaneous tissues, liver, airway, gastrointestinal tract, or other internal organs. Key clinical features can include a rapidly growing vascular mass, ulceration, bleeding, functional impairment (such as visual obstruction when periorbital, or airway compromise in subglottic locations), and in cases of large or hepatic hemangiomas, high-output cardiac failure or consumptive hypothyroidism. Segmental hemangiomas may be associated with PHACE syndrome (posterior fossa anomalies, hemangioma, arterial anomalies, cardiac defects, and eye abnormalities) or LUMBAR syndrome. Treatment depends on the location, size, and associated complications. Oral propranolol is the first-line systemic therapy and has revolutionized management since its introduction, significantly reducing the need for surgical intervention. Topical timolol may be used for smaller, superficial lesions. In refractory or life-threatening cases, systemic corticosteroids, vincristine, or surgical excision may be considered. Laser therapy can address residual telangiectasias. Close monitoring by a multidisciplinary team including dermatology, pediatric surgery, and relevant subspecialists is recommended for rare or complicated presentations.

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