PTH and Marchiafava-Bignami disease: Serum PTH and calcium levels fluctuated over time (Figure 2), leading to discontinuation of cinacalcet 12 months postoperatively when PTH had dropped to 184 pg/mL, below the target values for dialysis (the normal upper limit is 2–9 according to CKD-Mineral Bone Disorder (CKD-MBD) guidelines [14]).