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Diagnostic imaging features of normal anal sacs in dogs and cats

View Article: PubMed Central - PubMed

ABSTRACT

This study was conducted to provide normal reference features for canine and feline anal sacs using ultrasound, low-field magnetic resonance imaging (MRI) and radiograph contrast as diagnostic imaging tools. A total of ten clinically normal beagle dogs and eight clinically normally cats were included. General radiography with contrast, ultrasonography and low-field MRI scans were performed. The visualization of anal sacs, which are located at distinct sites in dogs and cats, is possible with a contrast study on radiography. Most surfaces of the anal sacs tissue, occasionally appearing as a hyperechoic thin line, were surrounded by the hypoechoic external sphincter muscle on ultrasonography. The normal anal sac contents of dogs and cats had variable echogenicity. Signals of anal sac contents on low-field MRI varied in cats and dogs, and contrast medium using T1-weighted images enhanced the anal sac walls more obviously than that on ultrasonography. In conclusion, this study provides the normal features of anal sacs from dogs and cats on diagnostic imaging. Further studies including anal sac evaluation are expected to investigate disease conditions.

No MeSH data available.


Positioning for anal sac scan (A and C). Approaching for ultrasonographic examination of the anal sac (B and D). The dog (C) and cat (D) were sedated, but sedation was not essential.
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Figure 2: Positioning for anal sac scan (A and C). Approaching for ultrasonographic examination of the anal sac (B and D). The dog (C) and cat (D) were sedated, but sedation was not essential.

Mentions: All dogs and cats were examined in sternum recumbency or standing position and the tail was reflected over the dorsum (Fig. 2). Ultrasound scanning (SA8000; Medison, Korea) with a linear array transducer (5–9 MHz) was utilized as a sonograph. Dorsal images of the anal sacs were obtained by scanning the anal region after routine skin preparation and use of transmission gel.


Diagnostic imaging features of normal anal sacs in dogs and cats
Positioning for anal sac scan (A and C). Approaching for ultrasonographic examination of the anal sac (B and D). The dog (C) and cat (D) were sedated, but sedation was not essential.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037300&req=5

Figure 2: Positioning for anal sac scan (A and C). Approaching for ultrasonographic examination of the anal sac (B and D). The dog (C) and cat (D) were sedated, but sedation was not essential.
Mentions: All dogs and cats were examined in sternum recumbency or standing position and the tail was reflected over the dorsum (Fig. 2). Ultrasound scanning (SA8000; Medison, Korea) with a linear array transducer (5–9 MHz) was utilized as a sonograph. Dorsal images of the anal sacs were obtained by scanning the anal region after routine skin preparation and use of transmission gel.

View Article: PubMed Central - PubMed

ABSTRACT

This study was conducted to provide normal reference features for canine and feline anal sacs using ultrasound, low-field magnetic resonance imaging (MRI) and radiograph contrast as diagnostic imaging tools. A total of ten clinically normal beagle dogs and eight clinically normally cats were included. General radiography with contrast, ultrasonography and low-field MRI scans were performed. The visualization of anal sacs, which are located at distinct sites in dogs and cats, is possible with a contrast study on radiography. Most surfaces of the anal sacs tissue, occasionally appearing as a hyperechoic thin line, were surrounded by the hypoechoic external sphincter muscle on ultrasonography. The normal anal sac contents of dogs and cats had variable echogenicity. Signals of anal sac contents on low-field MRI varied in cats and dogs, and contrast medium using T1-weighted images enhanced the anal sac walls more obviously than that on ultrasonography. In conclusion, this study provides the normal features of anal sacs from dogs and cats on diagnostic imaging. Further studies including anal sac evaluation are expected to investigate disease conditions.

No MeSH data available.