a disorder characterized by short stature, round face, short neck, and shortening of metacarpal bones with normal blood chemistry values and normal renal response to parathyroid hormone. In addition, the parathyroid glands are intrinsically normal, and parathyroid hormone levels are also normal. These patients, although they have the same phenotype as those with pseudohypoparathyroidism, have true hypoparathyroidism.

Source: Medcyclopedia.

Pseudopseudohypoparathyroidism is an inherited disorder that closely simulates the symptoms, but not the consequences of pseudohypoparathyroidism, thus it has mild or no manifestations of hypoparathyroidism or tetanic convulsions.

At 30 letters, the English name of the disorder is one of the candidates for being the longest word in English.

Source: Wikipedia.org.