Osteoma - skull vault
Painless swelling on left side of scalp.
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A well defined hyerdense bony lesion 1.5 x 1.2 cm in size in outer table of left parietal bone near the coronal suture without surrounding soft tissue.
Osteomas should be distinguished from osteochondromas, which has a cartilaginous (lucent) area and occasional speckled foci of calcified cartilage matrix.
Osteochondromas may have marrow contained within the stalk which is continuous with the marrow cavity of the parent bone. Osteomas do not have a marrow cavity.