The stomach is the most frequent site of gastrointestinal stromal tumor (GIST) occurrence.
The common clinical manifestation of GIST are melena and hematochezia caused by gastointestinal bleeding. But hemoperitoneum caused by GIST rupture is a very rare condition.
We describe a 33-year-old man with gastric GIST causing hemoperitoneum.
A preoperative CT scan demonstrated large amount of fluid collection and extraluminal mass lesion in gastric antral area.
He underwent an emergent laparotomy.
The antral mass was polypoid shaped and showed ruptured focus. We performed a distal gastrectomy.
The tumor was revealed GIST by pathologic examination and considered as intermediate risk.
The patient had an uneventful postoperative course and remains well.

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