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An Extrafollicular Adenomatoid Odontogenic Tumor Mimicking a Periapical Cyst

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An Extrafollicular Adenomatoid Odontogenic Tumor Mimicking a Periapical Cyst Hindawi Case Reports in Radiology Volume 2018, Article ID 6987050, 5 pages https://doi.org/10.1155/2018/6987050 Case Report An Extrafollicular Adenomatoid Odontogenic Tumor Mimicking a Periapical Cyst Farzaneh Mosavat ,1 Roxana Rashtchian,1 Negar Zeini ,1 Daryoush Goodarzi Pour,1 Shabnam Mohammed Charlie,1 and Nazanin Mahdavi2 1 Oral and Maxillofacial Radiology Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2Oral and Maxillofacial Pathology Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Correspondence should be addressed to Negar Zeini; [email protected] Received 4 April 2017; Accepted 13 July 2017; Published 1 January 2018 Academic Editor: Soon Tye Lim Copyright © 2018 Farzaneh Mosavat et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Adenomatoid odontogenic tumor (AOT) is a rare noninvasive odontogenic tumor that occurs mostly in the second decade of life. Based on its tooth association, AOT can be classifed into three categories of follicular, extrafollicular, and peripheral types; the follicular classifcation is considered as the most common type of AOT. Tis study reported a large extrafollicular case of AOT in a 40-year-old female. She was asymptomatic and tumor was detected accidentally by her dental practitioner. Since the panoramic radiograph showed a well-defned unilocular radiolucent lesion, we observed radiopaque spots within the lesion by using cone beam computed tomography. Te extrafollicular type can mimic a periapical radiolucent lesion. 1. Introduction attached to the gingival structures [9]. Internal radiopaque focus was considered as one of the signifcant features of Adenomatoid odontogenic tumor (AOT) is a slow-growing, AOT, which can help its diferential diagnosis from other well-defned tumor accounting for 3–7% of all odontogenic bone cystic lesions [10]. Philipsen and Reichart showed that tumors [1]. Some authors consider AOTs to be benign nearly two-thirds of AOTs had radiopaque spots inside the and noninvasive neoplasms; however others describe them lesion [11]. Te diferential diagnosis of AOT from other as developmental hamartomas odontogenic growths [2]. lesions similar to AOT (e.g., dentigerous cyst, keratocyst Although the AOT is considered as a low occurrence tumor odontogenic tumors, unicystic ameloblastoma, and calcifying in the literature, Philipsen et al. reported that AOT ranks fourth among the odontogenic tumors. Te increasing num- cystic odontogenic tumors) in radiographic fndings may be ber of reports in literature on AOT shows that the tumor difcult. Te ability of radiographic modality on showing develops more frequently than expected [3–5]. Depending theradiopaquefociwithinalesionisessentialforthe on its location and tooth association, AOT can be divided diagnosisofAOT[7].Inthecaseofsmallopacifcation into three classifcations of follicular, extrafollicular, and or superimposed area in the anterior region, CBCT is peripheral type. About 70% of AOTs were identifed as benefcial modality in demonstrating the detailed internal follicular, which is associated with an impacted permanent structures of lesions including radiopaque calcifed spots or supernumerary tooth; radiographic examination showed [10]. a well-circumscribed, unilocular radiolucent lesion which is diagnosed earlier in life than extrafollicular type (mean age 2. Case Report of 17 years) [6–8]. Te extrafollicular type is a central lesion that is not A 40-year-old female patient visited the Department of Oral related to the embedded teeth, and the peripheral type is and Maxillofacial Radiology of Tehran Dental School. 2 Case Reports in Radiology Figure 1: Panoramic radiograph shows a single large radiolucent lesion with well-defned border. She was asymptomatic and the lesion was detected inci- cases)[2,16].Teperipheraltypecanbesimilartoagingival dentally at routine radiography by her dental practitioner. fbroma or epulis [17]. Central tumor may have two types: (1) Intraorally, the patient had mild bony hard swelling in follicular type is associated with an impacted tooth (73% of the anterior region of the mandible. Te overlying mucosa all cases) and is ofen detected in mean age of 17 years and (2) was normal, and there was no sign of acute dentoalveolar extrafollicular type is ofen detected in mean age of 24 years or mucosal infection in the mandible region. Te ante- (24% of all cases) [2, 3]. Te extrafollicular type may appear rior mandibular teeth were displaced without mobility. Te as a periapical radiolucent lesion mimicking periapical cyst panoramic radiograph revealed a well-defned unilocular or intrabony defect [18, 19]. radiolucency with corticated rim, which extended from right Radiographically, central AOT presents as well-defned, to lef mental foramens. Because of the lesion, the roots of almost always unilocular radiolucency [20]. Expansion of the lef lateral mandibular incisor and canine were deviated the cortical plate can be presented. As a result of tumor and resorbed (Figures 1 and 2(c)). Te shadow of cervical expansion, adjacent teeth may be displaced. Tooth displace- spine was superimposed over the central part of the lesion ment is more common than root resorption [21]. Tis case (Figure 2(b)). Axial slice showed expansion of buccal and lin- had unusual radiographic features; it was huge extrafollicular gual cortical plates in the anterior mandible with perforation AOT without any radiopaque foci in panoramic radiograph along the outer cortical plate at the lef side (Figure 2(a)). mimicking a periapical lesion. Although AOT occurs most Diferential diagnosis included calcifying odontogenic cyst, ofen in second decade, the patient was a 40-year-old female. central giant cell granuloma, AOT, and ameloblastoma. Te Late diagnosis of the present case could be due to slow lesion was completely enucleated. Microscopically, epithelial growth and lack of interaction with tooth eruption. Te most cellswerearrangedasspindleshapedcellsinsheetsand common site of extrafollicular AOT is anterior region of trabecular pattern and can form duct-like and rosette-like maxilla (incisor to canine). Our case was observed in the structures in a scant hyalinized stroma (Figure 3(d)). anterior region of mandible, which is the second common On gross examination the lesion appears as an ellip- site [22]. It has reported that only 28% of AOT lesions tical tissue, measuring about 3.5 × 2.7 cm in size (Fig- occurred in the mandibular incisor area [23]. Generally in ures 3(a) and 3(b)). Cut section of the mass revealed patient with AOT lesion, the lamina dura is commonly multiple cystic spaces and solid area. Small calcifcations intact and periodontal ligament is normal. But, in our case, foci are scattered throughout the tumor. Small islands lamina dura cannot be radiographically detected and there of tumoral cells have infltrated the fbrous capsule (Fig- was signifcant root resorption of the involved teeth. Te ure 3(c)). Tus, the fnal diagnosis was given as extrafollicular lack of intact periodontal ligament and lamina dura in the AOT. involved teeth makes a more likely diagnosis of radicular cyst [18]. Since root resorption rarely occurred in AOT lesion, 3. Discussion we detected displacement of the adjacent teeth (especially at the right side) and root resorption of the involved teeth AOT is a rare odontogenic tumor [12]. Te prevalence of [2]. Te size of the current lesion was 3.5 × 2.7 cm; this was AOT is less than odontoma, cementoma, myxoma, and is consistent with the size of tumor used in the previous ameloblastoma [13]. AOT is a noninvasive, benign lesion study, which was 1.5–3 cm in diameter [24]. Yilmaz et al. representing 2–7% of all odontogenic tumors [14]. AOT described an AOT causing painless swelling in the anterior usually appears in the age group of 5–50 years; two-thirds mandible which was bony hard with no previous history ofthecasesarediagnosedintheseconddecadeoflife,with of trauma, tenderness, discharge, or any other symptoms. an average age of 16 years. Tere is a predilection of AOT Tese fndings were consistent with that of our case [9]. in females (female to male ratio = 1.9 : 1). At least 75% of CBCT has the superiority over panoramic radiograph in lesions occur in the anterior maxilla, followed by the anterior providing information on the detailed internal structure of mandible, and radiopacities were developed inside 77% of the lesion; this can be ascribed to the small calcifed area radiolucent lesions [2, 15]. As mentioned above, this tumor in the lesion. CBCT is the preferred option due to elimi- has two variants, that is, central and peripheral type (3% of all nation of superimposition and high contrast resolution for Case Reports in Radiology 3 (a) (b) (c) Figure 2: (a) Axial sections show that mental foramen is not involved but has close contact with border of the lesion at the lef side. (b) Cross- sectional CBCT images reveal radiopaque spots inside the lesion indicated by white arrows in the image. (c) Tree-dimensional volumetric surface rendering. mineralizedtissuesuchasbonesandcalcifedfoci.Terefore, Some authors have reported that even incompletely removed every single detail of a lesion is well depicted on CBCT lesion does not recur [17]. images. In summary, some clinical and radiographic features including age and radiolucent appearance of the lesion in 4.
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