The purpose of this study is to assess the degree of sarcopenia by CT and to analyze its association with morbidity and mortality after esophagectomy and / or total gastrectomy. It is also intended to analyze the association between the degree of the CT-guided sarcopenia and the nutritional status of the patients evaluated by clinical parameters, both preoperative and postoperative. Besides that, to verify the association between the degree of sarcopenia and body fat rate.
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Degree of sarcopenia
Timeframe: Preoperative - around 30 days before surgery
Morbidity and mortality
Timeframe: Postoperative - 30 days after surgery