Parathyroidectomy May Cause Remission of Uraemic Tumoral Calcinosis in Haemodialysis Patients

Few cases of uraemic tumoral calcinosis (UTC) have been reported. This study aimed to investigate the clinical efficacy of parathyroidectomy for UTC. Historical clinical data of patients with end-stage renal disease and UTC who underwent parathyroidectomy were analysed. Absorption of metastatic calcification was compared before and after operation. Changes in intact parathyroid hormone, serum calcium, phosphorus, and alkaline phosphatase levels were analysed before parathyroidectomy and at 1 week and 3, 6, and 12 months after parathyroidectomy. Eight patients met the enrolment criteria (men, 6; mean age, 38.6 SD 10.9 years). Uraemic tumoral calcinosis, which developed 2-8 years after dialysis began, was caused by secondary hyperparathyroidism. Massive calcium deposition was found in the shoulder (n = 6), hip (n = 3), and elbow (n = 2). Four patients had > 2 joints affected, and a single joint was involved for four patients. Seven patients had rapid remission (< 6 months) of the masses after parathyroidectomy. In one patient, the mass remained unabsorbed until 6 months postoperatively. Hypocalcaemia occurred in all patients where parathyroidectomy was successful, and calcium supplementation was required 1 year postoperatively. Serum intact parathyroid hormone levels on day 7 and at 3 and 6 months postoperatively decreased significantly from baseline and remained low 1 year postoperatively (22.015 SD33.134 pg/mL). Postoperative phosphorus levels were significantly lower than preoperative levels (p < 0.05), but no significant difference was found in alkaline phosphatase levels (p > 0.05). Parathyroidectomy has promising efficacy for UTC treatment and regulation of serum intact parathyroid hormone and phosphorus. Hypocalcaemia is a common complication after parathyroidectomy. Current Controlled Trials ChiCTR2000041311, date of registration: Dec. 23, 2020.