Merck Manual

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Sacrocaudal dysgenesis, dog (radiograph)
Sacrocaudal dysgenesis, dog (radiograph)
Sacrocaudal dysgenesis, dog (radiograph)

Dog with sacrocaudal dysgenesis. Note 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.