 Almost all who undergo parathyroidectomy experience increased bone density and repair of the skeleton within weeks . Additionally , patients with OFC who have undergone parathyroidectomy begin to show regression of brown tumors within six months . Following parathyroidectomy , hypocalcaemia is common . This results from a combination of suppressed parathyroid glands due to prolonged hypercalcaemia , as well as the need for calcium and phosphate in the mineralization of new bone . 
