<prompt> X-ray of a patient shows the following changes: Bulbous ends of long bones, normal appositional bone growth and there is failure of physiologic root resorption. Lab finding shows myelophthisic anemia. What can be the probable diagnosis?Fibrous dysplasiaOsteomyelitisOsteopetrosisPagets disease  <response>: OSTEOPETROSIS:Roentgenographic features:Medullary cavities are replaced by bone and the cortex is thickened.Density of bone may be such that, the roots of the teeth are nearly invisible on dental roentgenogram.Ends of long bones are bulbous called Erlenmeyers flask deformity.In osteopetrosis, there is normal appositional bone growth, but failure of physiologic root resorption.On X-ray, bones might appear club-like or show an appearance of a bone within bone Endobone. Vertebrae are extremely radiodense and may show alternating bands, known as the rugger-jersey sign.Lab findings of Osteopetrosis:Myelophthisic anemia as bone marrow is replaced by bone.Hypocalcemia Shafer reports normal serum calcium, phosphorus and alkaline phosphatase levels.Secondary hyperparathyroidism. 