# Cotton wool appearance is seen in:

 # Cotton wool appearance is seen in:
A. Paget’s disease
B. Osteomyelitis
C. Fibrous dysplasia
D. Achondroplasia

The correct answer is A. Paget's disease.

The radiographic appearance of chronic diffuse sclerosing osteomyelitis is, as the name suggests,
that of a diffuse patchy, sclerosis of bone often described as ‘cotton-wool’ appearance. This radiopaque lesion may be extensive and is sometimes bilateral. In occasional cases, there is bilateral involvement of both the maxilla and the mandible in the same patient. Because of the diffuse nature of the disease, the border between the sclerosis and the normal bone is often indistinct. The pattern may actually mimic Paget’s disease of bone or cemento-osseous dysplasia.

Reference: Shafer's 

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