Suspected Lateral Periodontal Cyst Presenting Concurrently with Canine Acanthomatous Ameloblastoma in a 2-Year-Old Standard Poodle.

Lateral periodontal cysts (LPCs) are odontogenic epithelial cysts composed of nonkeratinized epithelial cells that are in the category of developmental cysts, rather than inflammatory cysts. Lateral periodontal cysts are rare both in people and domestic animals; they are associated with vital teeth and located lateral to a tooth root. Lateral periodontal cysts are typically asymptomatic lesions that are characterized radiographically as a unilocular lucency with well-defined corticated borders. Canine acanthomatous ameloblastoma (CAA) is the most common odontogenic neoplasm in dogs and rarely presents as a cystic lesion. This case report describes the diagnosis and treatment of a cyst that occurred as a swelling apical to a gingival mass that was diagnosed histologically as CAA. Surgical management by conservative gingivectomy, cyst enucleation, and bone grafting was an effective treatment in this patient.

Surgical exposure and orthodontic extrusion of an impacted canine tooth in a cat: a case report.

A 7 month-old, male domestic shorthaired cat was referred because of facial swelling, an operculated cystic oral mass, and impaction of the associated maxillary left canine tooth. Surgical exposure and realignment failed to result in eruption. Surgical reexposure and orthodontic extrusion resulted in a functional alignment of the tooth within the dental arch. Follow up evaluations over the 5 ensuing years indicated persistence of the facial deformation, no evidence of ameloblastic biotransformation, and a healthy tooth.

Periodontal inflammatory and cystlike lesions in BDF1 and B6C3F1 mice.

Periodontal inflammatory and cystlike lesions were detected in aged BDF1 and B6C3F1 mice. Lesions were unilateral, single, and located in the labial region of the incisor teeth. The largest cystlike lesion deformed the skull. Histologically, the cystlike lesions were classified into three types: predominantly an inflammatory reaction, predominantly a cyst formation, and a mixed lesion. These periodontal inflammatory and cystlike lesions were pathogenetically similar and were considered sequential changes; the lesions showing both cyst formation and inflammatory reaction seemed to be intermediate along a path toward formation of large cysts. The cysts probably were derived from periodontal tissue and developed as a result of inflammatory reaction to foreign bodies, including hair. The term "murine periodontal cyst" is proposed for this lesion. Detailed pathogenetic studies on murine odontogenic cystic lesions may be warranted.