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OBJETIVO: Descrever os achados tomográficos do tumor estromal gastrintestinal de origem gástrica. MATERIAIS E MÉTODOS: No período de janeiro de 1999 a dezembro de 2006, foram selecionados 14 pacientes com diagnóstico histopatológico e imuno-histoquímico de tumor estromal gastrintestinal gástrico que apresentavam tomografia computadorizada realizada anteriormente ao tratamento. As variáveis tomográficas analisadas foram: topografia da lesão, dimensões, homogeneidade, contornos, limites, morfologia, padrão e intensidade do realce pelo meio de contraste venoso, padrão de crescimento, invasão de órgãos adjacentes, presença de ulceração, fístula, calcificações, infiltração da gordura mesentérica, linfonodomegalias e metástases a distância. RESULTADOS: Os tumores foram localizados no corpo (57,1%) ou fundo gástrico (42,9%), com dimensões variando entre 6,0 e 23,0 cm (média de 11,5 cm). O crescimento foi predominantemente extraluminal (57,1%) ou intra/extraluminal (35,7%). O realce pelo contraste venoso foi discreto em 50% dos casos, moderado em 50% e heterogêneo em 64,3%. Foram ainda observadas hipodensidade central em 64,3% dos casos, invasão de órgãos adjacentes em 42,9% e metástases hepáticas em 7,2%. CONCLUSÃO: No presente estudo, a maioria dos tumores localizava-se no corpo gástrico, com tamanho médio de 11,5 cm, apresentando área hipodensa central, realce heterogêneo pelo meio de contraste e crescimento predominantemente extraluminal. OBJECTIVE: The purpose of this study was to describe the tomographic findings of gastric gastrointestinal stromal tumor. MATERIALS AND METHODS: Fourteen patients with histopathologically and immunohistochemically confirmed gastric gastrointestinal stromal tumors, who had already been submitted to computed tomography scans before the treatment, were evaluated in the period between January 1999 and December 2006. The following tomographic variables were analyzed: lesion topography, size/dimensions, homogeneity, contour, margins, morphology, pattern and intravenous contrast-enhancement intensity, growth pattern, invasion of adjacent organs, presence of ulceration, fistula, calcifications, mesenteric fat infiltration, lymphadenomegaly and presence of distant metastasis. RESULTS: Tumors were found in the body (57.1%) or in the gastric fundus (42.9%), with sizes ranging between 6.0 cm and 23.0 cm (mean, 11.5 cm). Predominantly extraluminal growth was observed in 57.1% of cases and intra/extraluminal in 35.7%. Subtle contrast-enhancement was observed in 50%, moderate in 50%, and heterogeneous in 64.3% of cases. Additionally, central hypodensity was observed in 64.3%, invasion of adjacent organs in 42.9%, and hepatic metastasis in 7.2% of cases. CONCLUSION: In the present study, the majority of tumors were found in the gastric body, with an average size of 11.5 cm, presenting with central hypodensity, heterogeneous contrast-enhancement and predominantly extraluminal growth

Aspectos tomográficos do tumor estromal gastrintestinal de origem gástrica: estudo de 14 casos