| Summary points: | A 15-year-old presents with 4-week history of swollen feet that increased progressively to involve the thighs and face, as well as fatigue, decreased appetite, and mild exertional dyspnea that did not respond to loop diuretics, which resulted in hypokalemia. This case provides details of the diagnostic tests, the pathological findings and differential diagnosis, and the possible causes of thiamine malabsorption. |