Spanish onion (photo)

Case contributed by Assoc Prof Frank Gaillard
Photo

Spanish onion demonstrating alternating layers reminiscent of onion-skin periosteal reaction.

Photo credit: Dr Frank Gaillard

Case Discussion

Multilayered periosteal reaction, also known as a lamellated or onion skin periosteal reaction, demonstrates multiple concentric parallel layers of new bone adjacent to the cortex, reminiscent of the layers on an onion.

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