Rain drop skull appearance is seen
Multiple myeloma
Eosinophilic granuloma
Pagets disease
Sickle cell anemia
Ref. Grainger and Allison's Diagnostic Radiology. Page. 409
 
MULTIPLE MYELOMA –RAIN DROP APPERANCE /PUNCHED OUT LESIONS IN THE SKULL
Imp radiological features –

Expansile osteolytic lesions associated with soft tissue masses
Diffuse osteolysis or generalised osteoporosis
Periosteal new bone formation is characteristically absent
Spine –diffuse lytic lesions