Collar sign of diaphragmatic rupture
Incidental finding on routine preoperative chest radiograph, further imaged with CT.
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Coronal and sagittal CT images show herniation of a part of the liver through a chronic right diaphragmatic rupture. Indentation of the liver by the diaphragm at the margins of the defect results in a characteristic waist like constriction, referred to as collar sign.
The collar sign sign, also called hourglass sign or cottage loaf sign, refers to a waist like constriction involving the contour of the herniated viscera including liver, bowel etc at the margins of the defect in diaphragmatic rupture. It is helpful in differentiating diaphragmatic rupture from other conditions such as chronic eventration and paralysis.
- The "dependent viscera" sign in CT diagnosis of blunt traumatic diaphragmatic rupture. Bergin D, Ennis R, Keogh C, Fenlon HM, Murray JG AJR Am J Roentgenol. 2001 Nov; 177(5):1137-40.
- Oikonomou A, Prassopoulos P. CT imaging of blunt chest trauma. Insights Imaging. 2011;2 (3): 281-295. doi:10.1007/s13244-011-0072-9