694
edits
Changes
no edit summary
==Introduction==
==Introduction==
Contrast procedures have been developed to '''increase the native contrast of organs''' in order to separate them from surrounding tissues. There are many situations where they can be a useful supplement to the information gained from routine radiographic examination. They can provide information on the '''size, shape and position''' of structures. They might help outline the internal structure of an organ, including its mucosal pattern, and sometimes help assess its function.
Contrast procedures have been developed to '''increase the native contrast of organs''' in order to separate them from surrounding tissues. There are many situations where they can be a useful supplement to the information gained from routine radiographic examination. They can provide information on the '''size, shape and position''' of structures. They might help outline the internal structure of an organ, including its mucosal pattern, and sometimes help assess its function.
==Articular Studies==
==Articular Studies==
'''Shoulder arthrography''' is useful in cases of suspected biceps tendon injury, for evaluation of shoulder [[Osteochondrosis Dissecans]] and for any other joint pathology such as tumours.
'''Shoulder arthrography''' is useful in cases of suspected biceps tendon injury, for evaluation of shoulder [[Osteochondrosis#Osteochondrosis dissecans (OCD)|Osteochondrosis Dissecans]] and for any other joint pathology such as tumours.
==Dacryocystorhinography==
==Dacryocystorhinography==
This technique involves injecting a radioopaque dye through the punctum in the eye and the canaliculus, and obtaining radiographs as the dye passes through the '''nasolacrimal system'''.
Under general anaesthesia, the upper punctum is cannulated and contrast is injected until it appears from the lower punctum or external nares.
This technique outlines the nasolacrimal drainage system and can help diagnose abnormalities associated with obstructions, deviations, congenital defects and neoplasms.
It is commonly used in [[Dacryocystitis – Rabbit|'''rabbits with dacryocystitis''']].
==Contrast Studies in Horses==
==Contrast Studies in Horses==
Contrast studies are mainly used to investigate '''orthopaedic conditions''' such as [[OCD]] in the shoulder, stifle and tarsus, and degenerative joint disease. Contrast medium is injected aseptically into the joint and orthogonal radiographs are taken.
Contrast studies are mainly used to investigate '''orthopaedic conditions''' such as [[Osteochondrosis#Osteochondrosis dissecans (OCD)|OCD]] in the shoulder, stifle and tarsus, and degenerative joint disease. Contrast medium is injected aseptically into the joint and orthogonal radiographs are taken.
Contrast studies are also extremely useful for the assessment of joint and tendon sheath integrity following a '''traumatic incident'''. Contrast can either be injected into the penetrating wound tract to assess dispersal of the medium. Alternatively, contrast can be injected into a joint or tendon sheath in an area away from the puncture, and leakage through the wound can be assessed.
Contrast studies are also extremely useful for the assessment of joint and tendon sheath integrity following a '''traumatic incident'''. Contrast can either be injected into the penetrating wound tract to assess dispersal of the medium. Alternatively, contrast can be injected into a joint or tendon sheath in an area away from the puncture, and leakage through the wound can be assessed.
{{Learning
|flashcards = [[Equine Orthopaedics and Rheumatology Q&A 18]]
}}
==References==
==References==
Easton, S. (2006) '''Veterinary radiography: a workbook for students''' ''Elsevier Health Sciences''
Easton, S. (2006) '''Veterinary radiography: a workbook for students''' ''Elsevier Health Sciences''
[[Category:To Do - Helen]]
{{review}}
==Webinars==
<rss max="10" highlight="none">https://www.thewebinarvet.com/diagnostic-imaging/webinars/feed</rss>
[[Category:Expert Review]]
[[Category:Clinical Techniques]]