PMC9251989_01
A round, homogeneously soft tissue opaque structure (ie, laryngeal cyst) was appreciated within the larynx on a right lateral radiograph of the head and neck region of the patient. Image courtesy of the referring veterinarian
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RI 1.9-5.7). Radiographs of the thorax and neck were performed and reviewed by a board-certified veterinary radiologist, with the pertinent finding of a homogeneously soft tissue opaque structure within the larynx, caudal to the epiglottis, which exhibited rounded cranial and caudal margins (Figure 1).
Photograph of the oral cavity and laryngeal area of the sedated cat demonstrating a large mass (ie, laryngeal cyst) protruding from the left side of the larynx, displacing the arytenoids laterally to the right
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On oral examination, on the left side lateral to the arytenoids, an apparently fluid-filled structure was noted, causing complete deviation of the arytenoids to the right and almost total occlusion of the larynx (Figure 2).
Echolaryngography of the anesthetized cat demonstrating a laryngeal cyst, as outlined by the yellow arrows
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The neck was assessed using point-of-care ultrasound and a thin-walled, round, hypoechoic-to-anechoic structure was found within the region of the larynx (Figure 3).
Post-contrast transverse CT image displayed on a soft tissue window width/window level at the level of the first cervical vertebra. A thin-walled, centrally fluid-attenuating structure (marked with a white star) is seen within the left aspect of the larynx. The structure has a thin, contrast-enhancing peripheral rim (white arrow) and occupies more than 50% of the laryngeal lumen
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The CT examination revealed an irregularly ovoid, fluid-attenuating (average Hounsfield units [HU] 13), poorly marginated structure occupying the left aspect of the laryngeal lumen (Figure 4), with a thin, soft tissue-attenuating (average HU 40) peripheral rim.