BackgroundRefractory hypercalcemia is one of the major complications of parathyroid carcinoma. Case reportAn 84-year old female patient presented with an acute confusional state due to hypercalcemia. This led to the diagnosis of primary hyperparathyroidism for which she underwent surgery. https://parisnaturalfoodes.shop/product-category/ubiquinol-active-q10-100mg/