Onion skin appearance is seen in:
Chronic osteomyelitis
Chronic osteomyelitis with proliferative periostitis
Garre’s chronic non-suppurative sclerosing osteitis
Both 2 and 3
Radiographic picture—Classical onion skin appearance due to cortical layer duplication is seen in both chronic osteomyelitis with proliferative periostitis and Garre’s chronic non suppurative sclerosing osteitis.