Extensive Rostral Mandibulectomy for Treatment of Ameloblastoma in a Horse

Méndez-Angulo, José L.; Tatarniuk, Dane M.; Ruiz, I.; Ernst, Nicolas S.

doi:10.1111/j.1532-950x.2014.12110.x

Cited by 15 publications

(25 citation statements)

References 18 publications

(30 reference statements)

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“…At follow up 18 months later, there was no evidence of recurrence. 29 The various subsets of ameloblastomas may explain the very variable CT characteristics we found. These findings were consistent with a similar case series, conducted by Amory et al 12 looking at the CT characteristics of odontogenic tumors in dogs in which variable and inconsistent imaging results of ameloblastomas were found.…”

Section: Discussionmentioning

confidence: 90%

Equine odontogenic tumors: Clinical presentation, CT findings, and outcome in 11 horses

Morgan

Fiske-Jackson

Hellige

et al. 2019

Vet Radiology Ultrasound

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Odontogenic tumors present as locally invasive, slow growing, firm swellings on the face. They are rare in all species and are characterized histologically by the degree of differentiation and dental tissue of origin. Radiographic appearance is not pathognomonic for these lesions. Computed tomographic (CT) examination allows exact determination of tumor extension and aggressiveness.The objectives of this retrospective, case series study were to describe the clinical presentation, CT characteristics, and outcome in horses with histologically confirmed odontogenic tumors, and to identify imaging features suggestive of individual types of tumors. Four ameloblastomas, two ameloblastic carcinomas, three ameloblastic fibromas, and two complex odontomas were included. All but one complex odontoma presented as a single mass. All tumors were associated with maxillary or mandibular bone expansion, alveolar and cortical bone lysis, and cortical bone thinning. The majority also had cortical bone thickening and periosteal proliferation. All tumors contained some degree of mineral attenuation, although only the complex odontomas contained enamel attenuation allowing differentiation from other types of odontogenic tumors in this study.Ameloblastomas were found to have variable CT characteristics likely due to the sub-groups of ameloblastomas. Both ameloblastic carcinomas contained a mixture of mineralized and soft tissue attenuating material whereas ameloblastic fibromas were mainly composed of soft tissue attenuating material. Computed tomographic characteristics of odontogenic tumors generally indicate that they are expansile, aggressive tumors and can occur in a wide range of ages. Further investigation is needed to elucidate differences between each type of equine odontogenic tumor.

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Section: Discussionmentioning

confidence: 90%

Equine odontogenic tumors: Clinical presentation, CT findings, and outcome in 11 horses

Morgan

Fiske-Jackson

Hellige

et al. 2019

Vet Radiology Ultrasound

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show abstract

“…It was not possible to exclude invasion of the cancellous bone of the maxilla, which would have indicated a higher likelihood of recurrence if surgical excision had been attempted. Rostral mandibulectomy and hemi‐mandibulectomy have been described for treatment of a mandibular ameloblastomas in adult horses . Surgical excision of the maxillary tumour in this case would have necessitated excision of portions of the right maxilla, the nasal septum and the permanent cheek teeth dental buds, causing significant disfiguration of the nose and dental arcades.…”

Section: Discussionmentioning

confidence: 96%

Maxillary unicystic ameloblastoma in a 6‐week‐old filly evaluated with computed tomography

et al. 2017

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Surgical excision was not deemed feasible with an athletic future in mind and the owners elected to euthanase the filly. Histopathologically, the mass was consistent with unicystic ameloblastoma and was lined intermittently with palisading, columnar basal cells (ameloblast-like cells) overlying a zone containing stellate cells in loose stroma. To the authors' knowledge this is the first report of a CT scan of an equine ameloblastoma. Although histopathology was essential for definitive diagnosis, CT clearly defined the origin of the mass and identified its locally extensive, cystic nature, which enabled informed decisions to be made.

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“…In this case complete excision resulted in loss of the symphysis and instability of the mandibles. In horses, resection of the mandible caudal to the symphysis may not require stabilization . Mendez‐Angulo et al reported performing a rostral mandibulectomy in an 19‐year‐old horse with an invasive ameloblastoma.…”

Section: Discussionmentioning

confidence: 99%

Management of an extensive equine juvenile ossifying fibroma by rostral mandibulectomy and reconstruction of the mandibular symphysis usingString ofPearls plates with cortical and cancellous bone autografts

2018

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Objective: To describe a surgical technique for rostral mandibulectomy and reconstruction of the mandibular symphysis. Study design: Case report. Animal: One 5-month-old warmblood cross filly. Methods: A preoperative diagnosis of a juvenile ossifying fibroma was made on the basis of clinical appearance and was later confirmed via histology. The tumor was large, rapidly growing and extending to the caudal aspect of the mandibular symphysis. Computed tomography was performed for surgical planning. The tumor was excised by performing a mandibulectomy caudal to the symphysis. The mandibular symphysis was reconstructed with String of Pearls (SOP) plates. Cortex screws placed in lag fashion, a cortical bone graft from one of the mandibles and a cancellous graft harvested from the tuber coxae. Results: At 9 months of age there was no sign of tumor reoccurrence, the implants were removed because of infection and the mandible had formed a new stable symphysis. The horse was able to prehend food and masticate normally. The owner was pleased with the cosmetic and functional outcome. Conclusion: The described surgical technique is a viable option for mandibulectomy and reconstruction of the mandibular symphysis. The technique provided adequate stability for healing to occur in the face of infection. Clinical significance: Neoplasia and other conditions affecting the entire mandibular symphysis can be treated by complete surgical excision and reconstruction.

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Extensive Rostral Mandibulectomy for Treatment of Ameloblastoma in a Horse

Abstract: Extensive rostral mandibulectomy (up to the caudal edge of the mandibular symphysis) can apparently be performed in a horse without internal or external stabilization, and yield a cosmetic and functional outcome.

Cited by 15 publications

References 18 publications

Equine odontogenic tumors: Clinical presentation, CT findings, and outcome in 11 horses

Equine odontogenic tumors: Clinical presentation, CT findings, and outcome in 11 horses

Maxillary unicystic ameloblastoma in a 6‐week‐old filly evaluated with computed tomography

Management of an extensive equine juvenile ossifying fibroma by rostral mandibulectomy and reconstruction of the mandibular symphysis usingString ofPearls plates with cortical and cancellous bone autografts

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