POSITIVE‐CONTRAST RHINOGRAPHY

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Abstract
Contrast rhinography is a simple noninvasive procedure that may be a useful diagnostic method for positive‐contrast radiographic evaluation of the nasal cavity, nasopharynx, and paranasal sinuses in the dog. A standardized and reliable technique was developed using healthy adult Greyhounds. The radiographic appearance of the regional anatomy after intranasal administration of positive‐contrast medium was established. Four contrast media: 60% propyl iodine, 37% organically bound iodine, a 60% barium sulfate suspension, and a 30% barium sulfate suspension were evaluated on the basis of their radiographic contrast and detail, distribution, and degree of evoked tissue reaction as defined by clinical assessment. A 30% barium sulfate suspension was selected using these criteria. Contrast medium enhanced the radiographic appearance of the regional anatomy when compared with noncontrast techniques. A procedure for positive‐contrast radiographic evaluation of the nasal cavity, nasopharynx, and paranasal sinuses is described in detail. Recommendations are made regarding methods of contrast medium administration and positioning to ensure uniform distribution within the area of interest.

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