Cotton wool appearance (bone), Radiology Reference Article

The cotton wool appearance is a plain film sign of Paget disease and results from thickened, disorganised trabeculae which lead to areas of sclerosis in a previously lucent area of bone, 

CT showing cotton-wool like images of the skull bones. (yellow arrows).

Imaging of Paget Disease of Bone and Its Musculoskeletal Complications: Review

Salt and pepper sign (skull), Radiology Reference Article

Paget's disease. Periapical film showing the cotton wool appearance

Paget disease of the bone: a triad of forms, Radiology Case

Imaging of Paget Disease of Bone and Its Musculoskeletal Complications: Review

Melorheostosis: A rare and painful bone disease

Cotton wool appearance (bone), Radiology Reference Article

Endosteal scalloping, Radiology Reference Article

Diagnostics, Free Full-Text

Paget's Disease of Bone - Endotext - NCBI Bookshelf

A FKBP5 mutation is associated with Paget's disease of bone and enhances osteoclastogenesis