Infant with Scalp Mass

The patient is a twenty-week-old infant with a scalp mass present for 2-3 months. It appears to be growing slowly. He was seven weeks premature; but otherwise all milestones have been normal. He had a type one intracranial bleed post partum but it was not complicated. He did have scalp vein IVs whilst in hospital, but it's unclear where they were.

The examination shows a 4x2.5 cm in diameter freely movable mass on the left parietal area. It feels firm. Skin and hair normal over it (in the photo it the hair looks a bit sparser over the lesion). Ultrasound was done and was interpreted as normal.



The mass looks benign. Do you have any suggestions about what this might represent and what to do at this point? Skull x-ray and CT may be indicated, however, I thought I'd get some opinions first.