|Year : 2014 | Volume
| Issue : 2 | Page : 83-85
Interradicular adenomatoid odontogenic tumor of mandible: A case report
S Tharanikumar, A Murali Balasubramaniam, Ajay Chandran, P Anu Sudha
Department of Oral and Maxillofacial Surgery, Sathyabama University Dental College and Hospital, Chennai, Tamil Nadu, India
|Date of Web Publication||31-Dec-2014|
Dr. S Tharanikumar
Department of Oral and Maxillofacial Surgery, Sathyabama University Dental College and Hospital, Jeppiaar Nagar, Chennai - 600 119, Tamil Nadu
Source of Support: None, Conflict of Interest: None
The present case report is of extrafollicular adenomatoid odontogenic tumor (AOT) in the mandibular anterior region, in a 20-year-old female patient. She reported with a painless swelling in the mandibular anterior region to our department of oral and maxillofacial surgery. Fine needle aspiration yielded no fluid. Periapical, panoramic radiograph showed circumscribed radiolucent area with fine calcifications. The lesion was totally enucleated and incisors, canine and premolars of that quadrant were removed. The rarity of AOT may be associated with its slowly growing pattern and symptomless behavior. Therefore, it should be distinguished from more common lesions of odontogenic origin in routine dental examinations.
Keywords: Adenomatoid odontogenic tumor, Cyst, Mandibular swelling
|How to cite this article:|
Tharanikumar S, Balasubramaniam A M, Chandran A, Sudha P A. Interradicular adenomatoid odontogenic tumor of mandible: A case report. J Indian Acad Dent Spec Res 2014;1:83-5
|How to cite this URL:|
Tharanikumar S, Balasubramaniam A M, Chandran A, Sudha P A. Interradicular adenomatoid odontogenic tumor of mandible: A case report. J Indian Acad Dent Spec Res [serial online] 2014 [cited 2019 Jun 25];1:83-5. Available from: http://www.jiadsr.org/text.asp?2014/1/2/83/148281
| Introduction|| |
Adenomatoid odontogenic tumor (AOT) is an uncommon, benign, and slow-growing tumor which is usually located in the anterior region of the maxilla without pain, , and represents 3% of all odontogenic tumors.  It often causes expansion of surrounding bone and displacement of adjacent teeth.  However, the slow growing nature of the lesion may cause the patients tolerate the swelling for years until it produces an obvious deformity.  The tumor is usually associated with unerupted teeth, frequently canines, or lateral incisors.  In this report of a case, we presented an AOT causing jaw swelling in the mandibular anterior region.
| Case Report|| |
A 20-year-old female was reported with a painless swelling in the mandibular anterior region. The patient had no systemic diseases nor used any medication. There was no history of trauma, pain, discharge, or any other symptoms related to the lesion. In the clinical examination of the head and neck, chronic lymphadenopathy was found on the right and left submandibular lymph nodes. Facial asymmetry was observed. [Figure 1] shows preoperative, intra-oral, asymmetry of the face. Intraorally, the patient presented a painless, slowly increasing swelling in the mandibular anterior region. A mild labiolingual expansion was seen on the mandibular anterior alveolus in relation to teeth 31-35. The tooth 32 and 33 was not responsive to electrometric pulp testing. The swelling had well-defined margins with normal overlying mucosa. The swelling was bony hard and nontender on palpation. Fine needle aspiration yielded no fluid. Periapical and panoramic radiographs shown in [Figure 2] portrays circumscribed radiolucent area with fine calcifications involving the teeth 31. No root resorption, but the displacement of these teeth was seen. The possibilities of ameloblastoma and calcifying odontogenic tumor were considered preoperatively. The lesion was enmass enucleated and the teeth 31-35 were removed as shown in [Figure 3]. Gross examination of the specimen showed a single pink-white soft tissue measuring 3 × 3 cm. Microscopy revealed a well-defined cystic tumor encapsulated with a thick, regular, fibrous connective tissue as shown in [Figure 4]. The tumor consisted of ameloblast-like epithelial cells forming duct-like structures. Eosinophilic droplets and irregular displaced odontogenic calcification areas were seen amongst the epithelial cells. The final diagnosis of AOT was obtained. Healing was uneventful 6 months after the surgery as shown in [Figure 5].
| Discussion|| |
The AOT is an uncommon cause of jaw swelling. There is a slightly female predilection over male, 2:1  and appears most often in the 2 nd decade of life.  The sex and the age of the patient we described in this report were consisted with the previous literature. The lesions are typically asymptomatic, but may cause cortical expansion and displacement of the adjacent teeth, as in the case reported here. The origin of the AOT is controversial. Because of its predilection for tooth-bearing bone, it is thought to arise from odontogenic epithelium. 
The tumor has three clinicopathologic variants, namely intraosseous follicular, intraosseous extrafollicular, and peripheral. The follicular type (in 73% of all AOT cases) is associated with an unerupted tooth; whereas, extrafollicular type (24%) has no relation with an impacted tooth  as in the case we presented here, and the peripheral variant (3%) is attached to the gingival structures. Follicular and extrafollicular types are over two times more common in maxilla than in mandible,  and most of the tumors involve anterior aspect of the jaws.  In our case, the tumor was an extrafollicular intraosseous type, and also found in the anterior region of the mandible.
Although larger lesions, the tumors are usually in the dimensions of 1.5-3 cm.  Radiographically, they usually appear unilocular,  may contain fine calcifications,  and irregular root resorption is rare.  This appearance must be differentiated from various types of disease, such as calcifying odontogenic tumor or cysts. The differential diagnosis can also be made with ameloblastoma, ameloblastic fibroma, and ameloblastic fibro-odontoma.  The patient we describe in this report presented no root resorption, but displacement of the adjacent teeth, and also the tumor was not associated with an impacted tooth. Radiographically, it was easily differentiated from dentigerous cyst, which usually occurs as pericoronal radiolucency.
The histological findings for AOT are remarkably similar in the literature. The histological features of the tumor were described as a tumor of odontogenic epithelium with duct-like structures and with varying degree of inductive changes in the connective tissue. The tumor may be partly cystic and in some cases the solid lesion may be present only as masses in the wall of a large cyst. The tumor may contain pools of amyloid-like material and globular masses of calcified material. Our case was consisted with these common features.
The tumor is well encapsulated and shows an identical benign behavior. Therefore, conservative surgical enucleation produces excellent outcome without recurrence. Our patient has been under follow-up for 6 months.
| Conclusion|| |
Because of being the extrafollicular variant of AOT, and with respect to the localization of the lesion in the mandible, our case is a rare case of AOTs. Additionally, it supports the above mentioned general description of AOT in the previous studies. We conclude that the rarity of AOT may be associated with its slowly growing pattern and symptomless behavior. Therefore, it should be distinguished from more common lesions of odontogenic origin in routine dental examinations.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]