Three-dimensional computed tomography rendering of pedunculated colon polyp: new “clapper-bell” sign pedunculated polyp at 3D computed tomography

Abstract

The incidental detection of a tubulovillous adenoma at a contrast-enhanced computed tomography (CECT) with nondedicated protocol, performed in emergency conditions, is an uncommon finding. We report a case of a woman presenting with a subocclusive episode. A CECT scan was performed, and a pedunculated polyp could be appreciated at 3D-reconstruction images. A particular depiction of pedunculus of the polypoid lesion, resemble a clapper-bell, could help to define the vegetating lesion at the volume-rendering reconstruction images. This case emphasizes the fundamental role of postprocessing in the clinical practice to improve the diagnostic accuracy of abdominal CT scan. In addition, a potential new radiologic sign, the “clapper-bell sign”, is proposed, as literature about the appearance of a polyp at CECT, performed without a dedicated protocol for colonoscopy, is poor.

Functional 3DVR imaging of abdominal wall hernias

“…3DVR is an image processing and visualization technique made possible by advances in computer hardware and software that has now been available for more than 15 years. 1 Although a number of clinical applications have been described, 3,4 to the best of our knowledge no role in the assessment of abdominal hernias has previously been reported. Bulge was most evident on the ballooning phase 2D and 3D images.…”

The Role of CT-Angiography in the Acute Gastrointestinal Bleeding: A Pictorial Essay of Active and Obscure Findings

“…The MPR and MIP images to be reconstructed also in the sagittal and coronal planes are useful, for example, to locate the bleeding intestinal segment and to map the artery affected by the haemorrhagic phenomenon in patients with an arterial bleeding source ( Figure 5 ); they also provide information on vascular anatomy, since anatomical variants are frequent [ 5 ]. Virtual rendering-three dimension (VR-3D) images can also be useful for pre-operative details ( Figure 6 ) [ 15 ]. In acute haemorrhage, a positive oral contrast agent could obscure contrast extravasation into the lumen while a neutral oral contrast agent can dilute contrast extravasation, making it more difficult to identify active bleeding; therefore, the use of oral contrast agents is not recommended in the event of active bleeding [ 3 ].…”