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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.


Signals on T2-weighted (A–F) and FLAIR (G–L) images of canine (A–C and G–I) and feline (D–F and J–L) anal sac contents.
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Figure 6: Signals on T2-weighted (A–F) and FLAIR (G–L) images of canine (A–C and G–I) and feline (D–F and J–L) anal sac contents.

Mentions: Anal sac contents showed variations in signal intensity and signal pattern because of their diversity. The signal intensity ranges in dogs were from slightly lower to higher than those of muscles on T1-weighted images. The ranges were similar or slightly higher in cats than those in muscles (panels D and E in Fig. 5). On T2-weighted and FLAIR images, the contents of the dog anal sacs showed a high signal intensity. However, a heterogeneous signal was observed in some cats (Fig. 6).


Diagnostic imaging features of normal anal sacs in dogs and cats
Signals on T2-weighted (A–F) and FLAIR (G–L) images of canine (A–C and G–I) and feline (D–F and J–L) anal sac contents.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Signals on T2-weighted (A–F) and FLAIR (G–L) images of canine (A–C and G–I) and feline (D–F and J–L) anal sac contents.
Mentions: Anal sac contents showed variations in signal intensity and signal pattern because of their diversity. The signal intensity ranges in dogs were from slightly lower to higher than those of muscles on T1-weighted images. The ranges were similar or slightly higher in cats than those in muscles (panels D and E in Fig. 5). On T2-weighted and FLAIR images, the contents of the dog anal sacs showed a high signal intensity. However, a heterogeneous signal was observed in some cats (Fig. 6).

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.