Forty-six-year-old male patient, socioeconomically deprived, living in an area of frequent flooding, was attended at the Alfa Institute of Gastroenterology HC-UFMG with dyspeptic symptoms, low fever, unintentional weight loss of 13 kg and intermittent diarrhea without abnormal elements in the stool, for the last five months. Also reported migratory polyarthralgia for about five years. His twin brother (monozygotic) had the same clinical picture. The additional investigation attached was requested.