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.