This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
Pepper pot appearance of skull is seen in: 
Select and explain. 
A. Multiple myeloma, B. Hyperparathyroidism, C. Sickle cell anemia, D. Fibrous dysplasia
B: Hyperparathyroidism
Answer: B: Hyperparathyroidism 
Explanation: Pepper pot skull - - seen in cases of Hyperparathyroidism - there is resorption of trabecular bone (skull) as well as there is loss of definition between inner and outer tables of skull * Cotton wool skull - Paget's disease * HAIR ON END Appearance - Severe Hemolytic anemias. * Punched Out Lesion - Multiple myeloma - (Multiple punched out lytic lesions)