A Pancreatic Head Tumor Arising as a Duodenal GIST: A Case Report and Review of the Literature

Table 1

Risk classification of duodenal GISTs modified after Miettinen and Lasota [15].

Amount of mitosis	Size (cm)	Risk
≤5 per 50 HPF	≤2	No risk
	2–5	Low
	5–10	High
>5 per 50 HPF	≤2	No data
	2–5	High
	5–10	High