- Hemangiomas must be greater than or equal to 50 cm2 clinically measured by taking the product of the two largest perpendicular diameters and have one of the following complications: ulceration, impairment of vision, impairment of hearing, obstruction of the airway, high output cardiac failure, bleeding, abdominal distention and/or compartment syndrome, compression of the spinal cord, or high risk of permanent disfigurement.