Fact-sheet: Bone island
Updated on 09/17/2021 at 12:16 PM
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Definition
Syn. Enostosis, bone island, termed "giant" if larger than 2 cm. Highly prevalent pseudotumor: mainly in adults, rarely in children
Clinical features
Asymptomatic, incidental finding
Radiography
Involves all bones except the skull.
Medullary osteosclerotic lesion that may involve the cortex, round or oval, sometimes with spiculated margins, stable over time or with slow progressive growth.
No criteria of aggressiveness (lysis, periosteal reaction, soft tissue mass, etc.)
MRI
No contrast enhancement
Nuclear medicine
Most often no uptake.
Management
Possible follow-up
Differential diagnosis
Osteoblastic metastasis.
Osteopoikilosis: multiple bone islands (epiphysis and metaphysis) sparing the skull and vertebrae.