In most cases, a diagnosis is made by connecting medical history with a physical examination. If there is any question of the diagnosis, radiologic imaging with ultrasonography, magnetic resonance imaging (MRI) or computed tomography (CT or CAT scan) may be needed. These tools can also help determine the size of the lesion.
If there is any concern for a possible malignant (cancerous) growth, a biopsy will be done. This involves a surgical procedure to take out a small section of tissue from the lesion for examination by a pathologist. Sometimes, the surgeon will remove the entire lesion.