Osteoporosis circumscripta
Encyclopedia
Osteoporosis Circumscripta Cranii refers to a highly circumscribed (focal) lytic lesion of the skull bone as seen on X-ray in patients with Paget's disease of bone
Paget's disease of bone
Paget's disease is a chronic disorder that can result in enlarged and misshapen bones. The excessive breakdown and formation of bone tissue causes affected bone to weaken, resulting in pain, misshapen bones, fractures, and arthritis in the joints near the affected bones...

s. This focal lesion can be fairly large. This finding is highly specific for Paget's disease of bones.
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