Collar sign in diaphragmatic rupture

Last revised by Mostafa Elfeky on 7 Sep 2020

The collar sign, also called the hourglass sign, is a helpful sign for diagnosis of diaphragmatic rupture on coronal or sagittal CT/ MR images and barium studies. It refers to a waist-like or collar-like appearance of herniated organs at the level of the diaphragm.

Small tear on the right side can appear as a subtle focal indentation of the liver on axial images and can be overlooked. This sign requires careful examination of multiplanar reformatted images 5.

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