Radiopaedia Blog

11th Oct 2013 11:10 UTC

Radiology Quiz #4

Can you spot the very important finding on these lumbar radiographs? 

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double pcl sign

Double PCL sign - appears on sagittal MRI images of the knee when a bucket-handle tear of a meniscus (most commonly the medial meniscus) flips medially and comes to lie anteroinferior to the posterior cruciate ligament (PCL), mimicking a second smaller PCL.

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4th Oct 2013 10:34 UTC

Radiology Quiz #3

26yo with abdominal pain and fever. Diagnosis? 

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  • Spinnaker sign - a neonatal chest radiograph sign of pneumomediastinum. It refers to the thymus being outlined by air with each lobe displaced laterally like spinnaker sails. This appearance may also be termed the thymic wing sign. Bonus radiology signs also demonstrated in this case include left-sided deep sulcus sign of pneumothorax and continuous diaphragm sign of pneumomediastinum. 

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