The Endocrine Chameleon: Expanding the phenotype of Pseudohypoparathyroidism 1A in infancy

The phenotypic spectrum of iPPSD2/PHP1A in neonates and infants may include severe gastrointestinal, pulmonary, and endocrine manifestations, which may delay diagnosis if not recognized as a spectrum disorder of Gsα deficiency. The cases support the hypothesis that early-life manifestations may indicate a more complicated course of the disease. Elevated PTH or TSH in infants with unclear symptoms or conditions should prompt evaluation for disorders of the iPPSD spectrum. In the absence of reliable predictors for the individual courses of PHP1A, in-depth clinical screening for possible manifestations beyond the classical spectrum is warranted even in infancy.