Dermoid sinus is a tubular indentation of the skin in the middle of the back, that may go as deep as the spinal canal. The tracts may be single or multiple. The condition occurs due to an abnormality early in embryonic development, in which there is incomplete separation of the tissues that will become the skin and the nervous system.
Various modes of inheritance have been suggested including dominant with incomplete penetrance, or recessive. It is possible that there is an inherent deficiency in the Rhodesian Ridgeback breed in the absorption or utilization of folic acid (a B vitamin), that leads to this defect.
The Thai Ridgeback and Rhodesian ridgeback are most commonly affected. The condition has also been seen in the Shih tzu and Boxer.
Note: This section of the Canada’s Guide to Dogs website is intended as a source of information only. It is not intended as a substitute for professional care. Always consult with your Veterinarian about health related matters.