Presentation
Incidental lesion on CT head. History of breast cancer.
Patient Data
Noncontrast CT head obtained for headache showed no acute intracranial abnormality, but there was a small sclerotic lesion in the right parietal bone that generated a recommendation for a bone scan. There is also an incidental finding of symmetric overgrowth of the inner table, frontal bone.
Single phase whole body bone scan performed using 20 mCi Tc99m MDP IV. Images obtained approximately 3 hours after radiotracer injection.
Whole body views show no evidence of osteoblastic metastatic disease.
Lateral views of the skull show no radiotracer uptake at site of right parietal lesion of interest. There is intense increased radiotracer uptake along the inner table of the frontal bone corresponding to bony overgrowth seen on CT, representing benign hyperostosis frontalis interna.
Case Discussion
Hyperostosis frontalis interna is a benign entity of unknown etiology. It is typically encountered in women 65 years and older and arises from the inner table of the frontal bone, occasionally extending to include the parietal bones.
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