Diploic hematoma is an uncommon lesion of the skull and only nine cases have been
reported. We report a 3-year-old girl who presented a progressive swelling of her
right parietal scalp. Image studies revealed an osteolytic lesion in the widened
parietal diploic bone with a central cyst formation. Operation was performed and
diploic hematoma was found. It was evacuated with preservation of the inner
cortical bone. One month after surgery, the skull bone showed excellent remodeling,
and no bony defect. A relationship between the anticoagulants and the diploic
hematoma is suggested. Consideration of treatment for diploic hematoma depends
on the integrity of the inner table.