Normal parameters in abdominal radiology of the dog and cat

The size, position and ease of demonstration of the major abdominal viscera have been recorded in a series of two hundred consecutive radiographic examinations of the dog and cat. Only the values for viscera either known to be normal following surgery or autopsy, or presumed to be normal on the basis of clinical findings, are presented. All values are expressed as a ratio of the length of the second lumbar vertebral body. The factors affecting organ visibility and the variations in normal organ size are discussed.