Which statement is true regarding PPHP?

Which statement is true regarding PPHP?

• A. Represents the double- pseudo form with resistance to PTH but no ectopic phenotype
• B. Represents the double- pseudo form with AHO phenotype
• C. Is the same as PHP Type 1A
• D. Is characterized by primary hyperparathyroidism

Answer: (A)

PPHP (pseudopseudohypoparathyroidism) sits in the pseudohypoparathyroidism spectrum and is defined by the Albright hereditary osteodystrophy (AHO) phenotype without biochemical resistance to parathyroid hormone. In PPHP, you typically see the skeletal/soft-tissue features of AHO—short stature, brachydactyly, rounded face, subcutaneous calcifications—but calcium, phosphate, and PTH levels respond normally to PTH; there is no renal resistance to PTH. Thus the important point about PPHP is the presence of AHO features without PTH resistance. The other statements are not correct for PPHP: PHP Type IA involves PTH resistance and shares AHO features, primary hyperparathyroidism is a different disorder driven by excess PTH production, and PPHP is not simply the same as PHP Type 1A. The take-home is that PPHP presents with AHO phenotype but normal PTH signaling.

PPHP (pseudopseudohypoparathyroidism) sits in the pseudohypoparathyroidism spectrum and is defined by the Albright hereditary osteodystrophy (AHO) phenotype without biochemical resistance to parathyroid hormone. In PPHP, you typically see the skeletal/soft-tissue features of AHO—short stature, brachydactyly, rounded face, subcutaneous calcifications—but calcium, phosphate, and PTH levels respond normally to PTH; there is no renal resistance to PTH.

Thus the important point about PPHP is the presence of AHO features without PTH resistance. The other statements are not correct for PPHP: PHP Type IA involves PTH resistance and shares AHO features, primary hyperparathyroidism is a different disorder driven by excess PTH production, and PPHP is not simply the same as PHP Type 1A. The take-home is that PPHP presents with AHO phenotype but normal PTH signaling.