A Nonfunctioning Pituitary Macroadenoma Presenting as Cyclical Vomiting and Severe Hyponatremia in a Young Female

Table 2

Differential diagnosis.

---

(1) Recurrent vomiting due to gastroesophageal reflux disease or any other abdominal pathology in the abdomen

(2) Chronic infection, e.g., pyelonephritis

(3) Eating disorder, e.g., anorexia nervosa

(4) Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

(5) Adrenal insufficiency

(6) Cyclical vomiting syndrome

(7) Psychogenic vomiting

---