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The Target Sign: Bowel Wall¹

¹ From the Department of Radiology, Centro Radiológico Luis Méndez Collado, Muñecas 444, San Miguel de Tucumán, Tucumán 4000, Argentina. Received June 28, 2003; revision requested September 9; revision received September 23; accepted October 21. Address correspondence to the author (e-mail: joahualli@sinectis.com.ar).

View larger version (43K): [in a new window]   Figure 1. Diagram shows cross section of bowel wall with three layers of high (inner black layer), low (middle gray layer), and high (outer black layer) attenuation. Together, these layers create a target appearance known as the target sign.

View larger version (157K): [in a new window]   Figure 2. Transverse CT scan of the abdomen after administration of oral and intravenous contrast material in a 42-year-old man with ischemic colitis. Layers representing target sign grossly correspond to muscularis propria (straight white arrow), submucosa (curved arrow), and mucosa (black arrow).