In this chapter, the sonographic diagnosis of carcinoid and submucosal tumors is discussed. For the sonographic diagnosis of these tumors, the assessment of wall stratification is essential. After deciding the main layer of the tumor, the shape, echogenicity, and blood vessel patterns are evaluated to diagnose each tumor. Contrast ultrasound is also useful for the evaluation of microperfusion of tumors. In most cases, the diagnostic ability of extracorporeal ultrasound, which is noninvasive and easy to execute, is almost equivalent to that of endoscopic ultrasound.
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