Facial swelling associated with impaction of the deciduous and permanent maxillary fourth premolars in a dog with patent ductus arteriosus.

A three-year-old Labrador retriever was referred for decreased appetite, a painful swelling in the region of the maxillary right fourth premolar, and a heart murmur indicative of patent ductus arteriosus (PDA) diagnosed 1.5-weeks prior to presentation. Oral examination and intraoral dental radiographs showed impaction of the maxillary right fourth premolar surrounded by reactive alveolar bone. Necrotic bone, remnants of the deciduous maxillary right fourth premolar, and the impacted permanent maxillary right fourth premolar were removed following surgical exploration of the area. The PDA was repaired without complication 2-weeks following oral surgery. The extraction site was healing appropriately, and the dog's inappetence and painful facial swelling had resolved.