scholarly journals Difference in Perfusion Parameters Between Gastric Cancer and Gastric Stromal Tumors: Evaluation With Oral Contrast Plus Contrast-Enhanced Ultrasonography

2020 ◽  
Vol 10 ◽  
Author(s):  
Xiaohua Wang ◽  
Hongju Kou ◽  
Huiliao He ◽  
Mingdong Lu ◽  
Lingling Zhou ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Oral Contrast ◽  
Stromal Tumors ◽  
Contrast Enhanced ◽  
Contrast Enhanced Ultrasonography

Nonepithelial Esophageal Tumors: Leiomyomas and GI Stromal Tumors

2019 ◽  
Author(s):  
Urs von Holzen ◽  
Daniel C Wiener ◽  
Jon O Wee
Keyword(s):  
Soft Tissues ◽  
Oral Contrast ◽  
Body Parts ◽  
Stromal Tumors ◽  
Nerve Sheath Tumors ◽  
Peripheral Nerve Sheath Tumors ◽  
Contrast Enhanced Ct ◽  
Contrast Enhanced ◽  
Esophageal Tumors ◽  
Common Group

Nonepithelial esophageal tumors can be classified into two groups. The most common group consists of GI stromal tumors (GISTs). The less common group consists of several tumors similar to tumors arising from soft tissues of other body parts (eg, lipomas, liposarcomas, leiomyomas, leiomyosarcomas, peripheral nerve sheath tumors). Differentiation between these two groups is based on the near-universal expression of CD117 in GISTs, as opposed to other spindle cell tumors. Although some of these tumors are asymptomatic and discovered accidentally during CT or endoscopies for other reasons, they often cause some unspecific symptoms (eg, bloating, dysphagia, early satiety). Contrast-enhanced CT with IV and oral contrast is the examination of choice to evaluate these tumors, as extent of the tumor and presence of metastatic disease can be determined. Surgical resection is generally recommended for tumors larger than 2 cm or symptomatic tumors. This review contains 4 figures, 2 tables, and 35 references. Key Words: GIST, leiomyoma, leiomyosarcoma, nonepithelial esophageal tumors, esophagus, diagnosis, treatment, follow-up

Nonepithelial Esophageal Tumors: Leiomyomas and GI Stromal Tumors

2019 ◽  
Author(s):  
Urs von Holzen ◽  
Daniel C Wiener ◽  
Jon O Wee
Keyword(s):  
Soft Tissues ◽  
Oral Contrast ◽  
Body Parts ◽  
Stromal Tumors ◽  
Nerve Sheath Tumors ◽  
Peripheral Nerve Sheath Tumors ◽  
Contrast Enhanced Ct ◽  
Contrast Enhanced ◽  
Esophageal Tumors ◽  
Common Group

Nonepithelial esophageal tumors can be classified into two groups. The most common group consists of GI stromal tumors (GISTs). The less common group consists of several tumors similar to tumors arising from soft tissues of other body parts (eg, lipomas, liposarcomas, leiomyomas, leiomyosarcomas, peripheral nerve sheath tumors). Differentiation between these two groups is based on the near-universal expression of CD117 in GISTs, as opposed to other spindle cell tumors. Although some of these tumors are asymptomatic and discovered accidentally during CT or endoscopies for other reasons, they often cause some unspecific symptoms (eg, bloating, dysphagia, early satiety). Contrast-enhanced CT with IV and oral contrast is the examination of choice to evaluate these tumors, as extent of the tumor and presence of metastatic disease can be determined. Surgical resection is generally recommended for tumors larger than 2 cm or symptomatic tumors. This review contains 4 figures, 2 tables, and 35 references. Key Words: GIST, leiomyoma, leiomyosarcoma, nonepithelial esophageal tumors, esophagus, diagnosis, treatment, follow-up

scholarly journals Automatic Detection of Gastric Wall Structure Based on Oral Contrast-Enhanced Ultrasound and Its Application on Tumor Screening

2021 ◽  
Vol 11 ◽  
Author(s):  
An Sui ◽  
Zhaoyu Hu ◽  
Xuan Xie ◽  
Yinhui Deng ◽  
Yuanyuan Wang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Layer Structure ◽  
Gastric Wall ◽  
Diagnostic Methods ◽  
Wall Structure ◽  
Gastric Disease ◽  
Oral Contrast ◽  
Gastric Diseases ◽  
Early Screening ◽  
Contrast Enhanced

Gastric cancer is the second most lethal type of malignant tumor in the world. Early diagnosis of gastric cancer can reduce the transformation to advanced cancer and improve the early treatment rate. As a cheap, real-time, non-invasive examination method, oral contrast-enhanced ultrasonography (OCUS) is a more acceptable way to diagnose gastric cancer than interventional diagnostic methods such as gastroscopy. In this paper, we proposed a new method for the diagnosis of gastric diseases by automatically analyzing the hierarchical structure of gastric wall in gastric ultrasound images, which is helpful to quantify the diagnosis information of gastric diseases and is a useful attempt for early screening of gastric cancer. We designed a gastric wall detection network based on U-net. On this basis, anisotropic diffusion technology was used to extract the layered structure of the gastric wall. A simple and useful gastric cancer screening model was obtained by calculating and counting the thickness of the five-layer structure of the gastric wall. The experimental results showed that our model can accurately identify the gastric wall, and it was found that the layered parameters of abnormal gastric wall is significantly different from that of normal gastric wall. For the screening of gastric disease, a statistical model based on gastric wall stratification can give a screening accuracy of 95% with AUC of 0.92.

scholarly journals Greyscale and contrast enhanced ultrasonography for characterization of gastric malignant tumors

2018 ◽  
Vol 1 (1) ◽  
pp. 8 ◽  
Author(s):  
Cristian Vasile Neciu ◽  
Ion Cosmin Puia ◽  
Alexandru Florin Badea ◽  
Mihai Socaciu ◽  
Emil Botan ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Malignant Tumors ◽  
Arterial Phase ◽  
Stromal Tumors ◽  
Gastric Tumors ◽  
Variable Pattern ◽  
Grey Scale ◽  
Contrast Enhanced ◽  
Contrast Enhanced Ultrasonography

Aims: To evaluate the utility of grey scale ultrasonography (US) and contrast enhanced ultrasonography (CEUS) for characterization of malignant gastric tumors.Material and methods: The study was conducted prospectively and it included a number of 30 patients with malignant gastric tumors diagnosed through upper tract endoscopy and biopsy: 25 adenocarcinomas, 3 lymphomas, and 2 stromal tumors. All the patients were examined by US, followed immediately by CEUS, using both oral and intravenous contrast agents. CEUS assessed the dynamics of the contrast agent during the arterial phase and the venous phase. The distribution characteristics of the contrast agent inside the region of interest (ROI) were also evaluated. Twenty four patients underwent surgery.Results: Adenocarcinomas presented heterogeneous enhancement with variable pattern, followed by a delayed wash-out in almost all of the situations. Lymphomas presented a variable pattern, intensity and homogeneity of the enhancement, followed by delayed wash-out. Stromal tumors showed early arterial intense and homogenous enhancement followed by moderate wash-out in venous phase.Conclusions: Grey scale US and CEUS are useful methods in characterizing gastric tumors and contribute to a more adequate evaluation of the lesions. The dynamics of the contrast agent may be suggestive for the anatomopathological nature of the tumor. Larger studies will be necessary in order to determine thepractical value of the method.

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