Table 2: Dawson’s criteria.17

1. Absence of peripheral lymphadenopathies

2. Absence of mediastinal lymphadenopathies in chest radiography

3. Normal peripheral blood smea

4. During laparotomy, the involvement is only esophageal, stomach and intestine or only of regional nodes

5. Absence of liver and spleen involvement, except for direct dissemination of the disease from an adjacent outbreak