A
- Accordion sign
- Appearance of bowel that may be seen with pseudomembranous colitis.
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| Marked submucosal edema (arrows) is present in the right colon. Oral contrast material (arrowhead) is trapped within the lumen |
- Air crescent sign
- Appearance of cavitation that may be seen with invasive apergillosis.
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| On healing, interval development of at least two air crescent signs (arrowheads), which coincided with recovery of the patient’s white blood cell count. |
- Anteater's nose sign
- Sign of calcaneonavicular tarsal coalition.
- Apple Core lesion
- Circumferential narrowing of the lumen secondary to colon cancer.
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