[Severe facial malformation caused by secondary hyperparathyroidism in uremia: report of 4 cases].

To investigate the etiology, characteristics and prevention of severe facial deformity in patients with uremia entering the dialysis stage. Four cases with uremia in the dialysis stage who presented with severe facial deformity between October 2011 and November 2018 were reviewed, including 3 males and 1 female. The ages were 31, 15, 51 and 61, respectively. The general information, clinical symptoms, biochemical indicators, relevant imaging indicators, diagnoses, treatments and efficacies of the 4 patients admitted to the First Affiliated Hospital of Anhui Medical University were collected. All the 4 patients appeared obviously shorter, accompanied by a certain degree of decline in self-care ability, multiple bone and joint pain and severe facial deformity. They presented with significantly increased serum levels of alkaline phosphatase, calcium, phosphorus and parathyroid hormone, and parathyroid hormone level>2 500 pg/ml.Ultrasonography and (99)Tc(m) radionuclide scan showed in situ or ectopic hyperplasia of parathyroid tissue. Bone radiography showed local decrease of bone mineral density and cystic changes.After parathyroidectomy, the serum levels of alkaline phosphatase, parathyroid hormone, calciumand phosphorus decreased significantly, while bone pain symptoms and facial deformities gradually improved. Secondary hyperparathyroidism is a serious complication in patients with dialysis and few of patients may have severe facial deformity (Sagliker syndrome) affecting their normal life and social activities. Parathyroidectomy can improve the facial deformity and the quality of life of patients.