<prompt> Increased density in skull vault is seen in -a Hyperparathyroidismb Multiple myelomac Fluorosisd Renal osteodystrophyacdadbcbde  <response>: All the causes of generalized increased in bone density can cause increased density of skull vault Practical imaging 2nd e 73Fluorosis and secondary hyperparathyroidism renal osteodystrophy cause increased density of skull vault. 