Diagnosis of Congenital Hemangioma
In most cases, a diagnosis is made by comparing the medical history with physical exam findings. If there is any uncertainty in being able to tell a hemangioma from other lesions or vascular malformations, an ultrasound can usually provide a definitive answer. In certain cases, an MRI (magnetic resonance imaging) or CT (computed tomography) are needed to make a diagnosis and determine the extent of the lesion.

If there is any question regarding the possibility of a malignant (cancerous) growth, a biopsy will be performed. This involves removing a small section of tissue from the lesion for microscopic examination by a pathologist.

Ultrasonography is performed with the child awake, while MRI and biopsy require general anesthesia. CT may be performed under sedation as well.