Samoyed's Ameloblastoma: A Diagnostic Challenge





Zoey, an eight-year-old spayed Samoyed, presented with an oral mass in her left rostral maxilla, posing a significant diagnostic puzzle for veterinarians. The mass, located near tooth 203 and extending towards tooth 204, was initially observed as an ulcerated palatal growth approximately 1 cm in diameter. Complicating matters, tooth 204 also exhibited a crown fracture with pulp exposure. Initial radiographic assessments showed some changes in the interdental space and alveolar margin, along with soft tissue swelling lateral to tooth 204. The first biopsy results indicated marked reactive mucosal hyperplasia with dysplasia and severe mixed inflammation, failing to align with the clinical suspicion of a tumor.
Due to the discrepancy between the clinical presentation and the initial pathological findings, a second opinion was sought, which confirmed chronic active gingivitis and fibrogingival hyperplasia. However, the veterinary team maintained their suspicion of a tumor. They considered the possibility of Wegener's granulomatosis, a rare inflammatory condition that can mimic neoplastic growths. A two-week trial of prednisolone was administered to Zoey, but with no reduction in the swellings, this inflammatory disease was ruled out. Consequently, a more aggressive second biopsy procedure was undertaken. This involved not only sampling the superficial mass but also extracting tooth 203 and obtaining deeper bone and soft tissue samples, which ultimately led to the definitive diagnosis of cystic conventional ameloblastoma, a rare intraosseous odontogenic tumor.
Following the conclusive diagnosis, Zoey underwent a cone-beam CT scan and a maxillectomy, involving the removal of teeth, bone, and soft tissue from the rostral maxilla. The surgical margins were confirmed to be clear, indicating a successful excision. This case serves as a crucial reminder for veterinary practitioners that when initial diagnostic results do not align with clinical observations, a more in-depth and comprehensive investigation, including deeper biopsies, may be necessary to achieve an accurate diagnosis and ensure optimal patient outcomes. Zoey's remarkable recovery and continued zest for life two years post-surgery underscore the importance of perseverance in the face of diagnostic complexities.