Merck Manual

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Sacrocaudal dysgenesis, dog
Sacrocaudal dysgenesis, dog
Sacrocaudal dysgenesis, dog

Illustration of the typical posture and lack of tail of a young animal with sacrocaudal dysgenesis. As shown in the associated lateral radiograph, the sacrum and coccygeal vertebrae fail to form. Commensurately, the caudal spinal nerves also fail to form. In this puppy, a meningocele was also present.

Courtesy of Dr. Rebecca Packer.