 First described in the nineteenth century , OFC is currently detected through a combination of blood testing , X @-@ rays , and tissue sampling . Before 1950 , around half of those diagnosed with hyperparathyroidism in the United States saw it progress to OFC , but with early identification techniques and improved treatment methods , instances of OFC in developed countries are increasingly rare . Where treatment is required , it normally involves addressing the underlying hyperparathyroidism before commencing long @-@ term treatment for OFC — depending on its cause and severity , this can range from hydration and exercise to surgical intervention . 
