Table 1 Commonly used criteria for assessing risk of GIST

   Very low

< 2 cm and < 5 mitotic index

   Low

2-5 cm and < 5 mitotic index

   Intermediate

5-10 cm and < 5 mitotic index

> 5 cm and 6-10 mitotic index or

   High

> 5 cm and > 5 mittic index or

> 10 cm and any mitotic index or

Any size and > 10 mitotic index

AFIP criteria ^{16, 17}

   Unknown *

Expect from following criteria

   Very low

≦ 5 cm and ≦ 5 mitotic index

   Low

Gastric: > 5 cm and ≦ 10 cm and ≦ 5 mitotic index

Others: > 2 cm and ≦ 5 cm, and ≦ 5 mitotic index

   Moderate

Gastric: > 10 cm and ≦ 5 mitotic index or

> 2 cm and ≦ 5 cm, and > 5 mitotic index

Others: > 5 cm and ≦ 10 cm, and ≦ 5 mitotic index

   High

Gastric: > 5 cm and > 5 mitotic index

Others: > 10 cm or > 5 mitotic index