Lesion Characteristics
Lesions were classified into 4 groups: focal, segmental, multifocal, and indeterminate (Table 1). Of note, there was a prevalence of focal lesions in the study population (71%), amongst which 279 (82%) were located on the head/neck, followed by 57 (17%) on the trunk/abdomen/back, and 40 (12%) on the upper extremities. Seventy-six (24%) IH lesions were classified as multifocal and 12 (3.8%) as segmental. Most lesions were between 11 and 20 mm (n=105, 30.9%) and 92 lesions were >31mm (27%).