PTH and pseudohypoparathyroidism type 1A: PHP1A is characterized by target organ resistance to parathyroid hormone (PTH) and features of Albright’s Hereditary Osteodystrophy (AHO) such as round face, short stature, subcutaneous calcifications and brachydactyly, whereas PHP1B classically presents as hormone resistance limited to PTH without AHO signs.