Fig. 5
From: Intra-arterial versus intra venous contrast-enhanced computed tomography of the equine head
Transverse CT and IV contrast enhanced CT images of two cases with a sinus cyst (right is to the left and dorsal is to the top). a Native CT image showing a fluid filled right caudal maxillary and conchofrontal sinus (circle). b Contrast enhanced CT image at the same level as image A, showing a thin mild contrast enhancement of the capsule (arrows). c Native CT image showing a fluid filled right caudal maxillary and frontal sinus (cross), a partial mineralised capsule is detected (arrows). d Contrast enhanced CT image at the same level as image C, showing the partial mineralised capsule (arrows) with an adjacent moderate contrast enhancement (arrowheads) revealing a much thicker capsule