<prompt> Bone within bone appearance is seen in -GV1LOsteoporosisOsteopetrosisBone infarct  <response>: Ans. is c i.e., Osteopetrosis o Bone within a bone appearance may be seen in osteopetrosis.Bone within a Bone appearanceo Bone within a bone appearance is seen in : - Normal neonate Prostaglandin El therapy Growth arrestrecovery lines Heavy metal e.g., Lead poisoning Bisphosphonate therapy Hypothyroidism Hypoparathyroidism Sickle cell anemia Hypercalcemia Hypervitaminosis D Osteopetrosis Rickets Osteomalacia healed phase Acromegaly Scurvy healed phase 