Happy April Fool's Day! Today's case is absolutely ridiculous.
You meet a child with round facies, short stature, short fourth metacarpal bones, obesity, subcutaneous calcifications, and developmental delay. You consult a geneticist who says that he would expect hypocalcemia, but when you test the patient's blood, you find normal calcium, phosphate, and parathyroid hormone levels.
Challenge: At 30 letters, this inherited disease is a contender for one of the longest words in the English language; what is it?