Diagnostic imaging of the gastrointestinal tract


Diagnostic imaging of the gastrointestinal tract

Figure 5.16. Imaging of focal thickening of the gastrointestinal wall.

Figure 5.12. Imaging of gastrointestinal foreign bodies.

Online Supplement 5.1. Imaging of the gastrointestinal tract. Techniques, patient preparation, and preprocedural considerations.

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Video 5.3. Ultrasound study of a 13-year-old Siberian cat presented with chronic vomiting. The B-mode ultrasound shows a massive transmural asymmetrical hypoechoic circumferential thickening of the wall of the pyloric antrum and a normal aspect of the gastric fundus and body. On colour Doppler, multiple intralesional vessels running perpendicular to the lumen are seen. On contrast-enhanced ultrasound, a homogeneous intense “radiating” washing is observed followed by a homogeneous progressive slow washout. Ultrasound-guided fine needle aspiration of the lesion was then performed using a 22-gauge needle and capillary technique, avoiding the lumen of the stomach. Cytological examination was consistent with high-grade lymphoma.

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Video 5.2. Ultrasound study of a 12-year-old domestic shorthair cat presented with anorexia and acute vomiting and diagnosed with intestinal ischaemia due to necrotising enteritis. The B-mode ultrasound demonstrates generalised ileus characterised by fluid-filled distended intestinal loops and decreased peristalsis. The small intestine has a diffusely thickened muscularis layer. A focal transmural asymmetrical eccentric hypoechoic thickening of the wall with loss of layering is observed in one segment (blue arrow). After intravenous administration of contrast medium, no enhancement is observed in the lesion, whereas adjacent small intestinal loops demonstrate normal enhancement. This was highly suggestive of ischaemia of the intestinal wall. The final diagnosis was obtained on necropsy following euthanasia, as the owner declined surgery due to the critical status of the patient.

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