Blunt diaphragmatic lesions: Imaging findings and pitfalls

Figure 10 Computed tomography findings in blunt diaphragmatic lesions - collar sign. These 3 mm thick multiplanar coronal reconstructions (2 different patients, A and B) show intrathoracic herniation of the stomach (A, “a”) and of the right colic flexure (B, “a”). In both cases the herniated material shows a hourglass shape as a consequence of the compression exerted on it by the ruptured diaphragm edges (arrows).