Merck Manual

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Unerupted premolar, dog
Unerupted premolar, dog

    Unerupted (red arrow) left mandibular first premolar tooth of a dog. Note the radiolucent area surrounding the unerupted tooth just distal to the canine tooth. In addition, the cystic area appears to affect the left mandibular second premolar tooth. A cystic lesion that is associated with an unerupted tooth is most consistent with a dentigerous cyst.

Courtesy of Dr. Brenda Mulherin.