PTH and pachyonychia congenita: Moreover, features that help identify PC in PHPT mimic the natural changes undergone by the parathyroid glands in SHPT (large dimensions, very high parathormone (PTH), high 99mTc-methoxyisobuthylisonitrile (99mTc-MIBI) scintigraphy uptake on scintigraphy, and low expression of vitamin D or calcium-sensing receptor) [11,12,16,18,19].