Newborn 7 days old with vomiting and dehydration clinical examination was normal except for hyperpigmentation of nipple. Electrolytes Na: 120 meq. K: 9 meq. most likely diagnosis -
Congenital adrenal hyperplasia due to a defect in CYP21A2 is suggested by episodes of acute adrenal insufficiency with hyponatremia, hyperkalemia, dehydration & vomiting
Cong, adrenal hyperplasia
Primary hypothyroidism
Panhypopituitarism
Pyloric stenosis