Osteoporosis circumscripta

Case contributed by Dr Chris O'Donnell

Presentation

Incidental finding on whole body bone scan performed to determine cause of low back pain

Patient Data

Age: 65 years
Gender: Male
Nuclear medicine

Well defined area of Increased isotope accumulation indicating bone turnover in the parietal region. 

CT

Rounded area of reduced bone density without expansion in the right parietal bone (arrows). No underlying brain abnormality, e.g. meningioma, and no associated soft tissue mass. 

Case Discussion

Osteoporosis circumscripta is rare and thought to be due to the early or lytic phase of Paget disease. Differential diagnosis is fibrous dysplasia.

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