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Year : 2014  |  Volume : 4  |  Issue : 3  |  Page : 53-55  

Desmoplastic ameloblastoma

Department of Oral Pathology, GITAM Dental College, Rushikonda, Vizag, Andhra Pradesh, India

Date of Submission26-Jan-2014
Date of Acceptance25-Apr-2014
Date of Web Publication15-Sep-2014

Correspondence Address:
Divya Uppala
Department of Oral Pathology, GITAM Dental College, Rushikonda, Vizag - 530 045, Andhra Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2229-516X.140743

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Desmoplastic ameloblastoma is a relatively rare variety of ameloblastoma and only very few cases have been reported so far. The present case is an elderly man who had reported with a swelling in the anterior mandible which turned up to be desmoplastic ameloblastoma. Proper diagnosis is necessary to report such a case, so that the actual incidence can be noted.

Keywords: Ameloblastoma, anterior, desmoplastic, mandible

How to cite this article:
Majumdar S, Uppala D, Kotina S, Veera SK, Boddepalli R. Desmoplastic ameloblastoma. Int J App Basic Med Res 2014;4, Suppl S1:53-5

How to cite this URL:
Majumdar S, Uppala D, Kotina S, Veera SK, Boddepalli R. Desmoplastic ameloblastoma. Int J App Basic Med Res [serial online] 2014 [cited 2022 Jan 22];4, Suppl S1:53-5. Available from: https://www.ijabmr.org/text.asp?2014/4/3/53/140743

   Introduction Top

The tumors that arise from odontogenic epithelium are called as ameloblastomas. Its histopathologic types are plexiform, follicular, acanthomatous, granular, and desmoplastic. [1] The desmoplastic variety is characterized by abundant collagenous stroma and small strands of compressed odontogenic type of epithelium. This feature makes it unique among the ameloblastomas. [2] The other rarer variants include basal cell, keratoameloblastoma, papilliferous keratoameloblastoma, and clear cell types. [3]

   Case Repor Top

A 55-year-old male patient presented to the Department of Oral Pathology, GITAM Dental College with the complaint of swelling in the right lower premolar region [Figure 1]. The patient had noticed the swelling 5 months back, which had slowly increased to the present size. On extraoral examination, noticeable facial asymmetry was observed due to swelling present on the right side of the mandible. The right submandibular lymph node was also palpable and non-tender. On intraoral examination, there was an ill-defined solitary swelling extending from the mesial aspect of 31 to the mesial aspect of 45, superioinferiorly extending from the superior margin of attached gingival to well beyond the gingival sulcus. Radiographic examination revealed a mixed radiolucency interspersed with radiopacities with ill-defined borders. Occlusal radiographs showed an ill-defined radiolucent lesion interspersed with radiopacities extending from the mesial aspect of 41 to the distal aspect of 45 [Figure 2] and [Figure 3]. The lesional tissue after excisional biopsy had gritty or "frozen ice-cream"-like consistency [Figure 4]. The lower border of the mandible was preserved so that the aesthetic and functional work-up could be done [Figure 5]. The cut surface was solid and whitish in most cases. The epithelial tumor islands were very irregular with a pointed stellate appearance or small strand like and discrete. The histopathology was characterized by stromal desmoplasia, small tumor nests and strands of odontogenic epithelium were scattered in the stroma [Figure 6],[Figure 7] and [Figure 8].
Figure 1: Intraoral picture of the patient

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Figure 2: Intraoral periapical radiograph

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Figure 3: Occlusal radiograph of the mandible

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Figure 4: Gross picture of the resected area

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Figure 5: Postoperative radiograph

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Figure 6: Histopathology showing odontogenic epithelium like areas in between dense collagen tissue fibers

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Figure 7: 40× magnification of the desmoplastic area

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Figure 8: 20× magnification of the area exhibiting peripheral cells of tumor island columnar cells with reverse polarity. Hypercellularity of spindle-shaped or polygonal cells and microcyst formation is seen focally

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   Discussion Top

The gross specimen most often consists of resected portions of jaws. More than 50% show multilocular mixed radiolucent/radiopaque lesions with ill-defined margins. Desmoplastic ameloblastoma represents approximately 4-13% of all ameloblastomas. [3] This lesion most commonly occurs between the ages of 17 and 72 years, with the mean age being 44.7 years and with a male predilection. [4] The prevalence of ameloblastoma in maxilla when compared to mandible is almost close to 1:1. Desmoplastic ameloblastoma s is found predominantly in anterior or premolar regions of the jaws. [5] The chief initial complaint usually is as a painless swelling of the jaw bone. It is smaller in size than other types of ameloblastoma, and occurs mainly in the alveolar region and occupies the tooth-bearing area. [6] The resorption of tooth roots and displacement of teeth is seen frequently. This variant exhibits no typical findings of ameloblastoma. The oxytalan fibers in the stromal tissue suggest that the tumor derived from the epithelial rest of Malassez in the periodontal membrane of a related tooth. The periphery of islands consists of cuboidal cells with hyperchromatic nuclei. The columnar cells with reversed nuclear polarity are rarely conspicuous. The central area consists of swirled, hypercellular, spindle-shaped, or squamous epithelial cells. Microcysts that contain eosinophilic amorphous deposits or appear empty may occur centrally. The stroma has extensive stromal desmoplasia characterized by moderately cellular fibrous connective tissue with abundant thick collagen fibers that seem to compress or "squeeze" the odontogenic epithelial islands from the periphery. Formation of metaplastic osteoid trabeculae (osteoplasia) may be present. Evidence of a capsule is not found. In the immunoprofile, the tumor cells exhibit variable expression of S100 protein and desmin, similar to other types of s olid multicystic a meloblastoma (SMA). Keratin immunoreactivity is confined to the tumor cells showing squamous differentiation. Decreased expression of CK19 and high expression of p63 is observed. [7] Vimentin is not expressed by either squamatoid or spindle-shaped cells. Differences in expression are attributed to diverse factors such as dedifferentiation or rate of proliferation of neoplastic cells, inherent cellular potential, or extracellular mediators. [8] Marked immunoexpression of transforming growth factor beta (TGF-β) points to the part played in prominent desmoplastic matrix formation. [9] Compared to the stroma of SMA, the desmoplastic stroma of desmoplastic ameloblastoma shows a strong positive reaction for collagen type VI, fibronectin, and type 1 collagen. Treatment is by resection (77.1%) and, in some cases, by enucleation and/or curettage. Long-term follow-up is a must after initial treatment. [10]

   Conclusion Top

As desmoplastic ameloblastoma is an uncommon lesion, it warrants proper diagnosis and treatment.

   References Top

1.Barnes L, Eveson JW, Reichart P, Sidransky D, Kleihues P, Sobin LH, editors. World Health Organization Classification of Tumors. Pathology and Genetics. Head and Neck Tumors. Lyon, France: IARC Press; 2005.  Back to cited text no. 1
2.Gardner DG, Heikinheimo K, Shear M, Philipsen HP, Coleman H. Ameloblastomas. In: Barnes L, Eveson JW, Reichart P, Sidransky D, editors. Pathology and Genetics of Head and Neck Tumors. Lyon, France: IARC Press; 2005. p. 296-300.  Back to cited text no. 2
3.Durmus E, Kalayci A, Ozturk A, Gunhan O. Desmoplastic ameloblastoma in the mandible. J Craniofac Surg 2003;14:873-5.  Back to cited text no. 3
4.Kim JD, Jang HS, Seo YS, Kim JS. A repeatedly recurrent desmoplastic ameloblastoma after removal and allobone graft: Radiographic features compared with histological changes. Imaging Sci Dent 2013;43:201-7.  Back to cited text no. 4
5.Reichert PA, Philipsen HP. Benign neoplasm′s and tumor-like lesions arising from the odontogenic apparatus showing odontogenic epithelium with mature fibrous stroma, without ectomesenchyme. In: Odontogenic Tumors and Allied Lesions. London: Quintessence Publishing Co. Ltd.; 2004. p. 41.  Back to cited text no. 5
6.Savithri V, Janardhanan M, Suresh R, Kumar RV. Desmoplastic ameloblastoma with osteoplasia: Review of literature with a case report. J Oral Maxillofac Pathol 2013;17:298-301.  Back to cited text no. 6
[PUBMED]  Medknow Journal  
7.Sherlin HJ, Natesan A, Ram P, Ramani P, Thiruvenkadam C. Immunohistochemical profiling of ameloblastomas using cytokeratin, vimentin, smooth muscle actin, CD34 and S100. Ann Maxillofac Surg 2013;3:51-7.  Back to cited text no. 7
[PUBMED]  Medknow Journal  
8.Matsuo A, Ueno S. Immunohistochemical demonstration of keratin in ameloblastoma as an indication of tumor differentiation. J Oral Maxillofac Surg 1991;49:282-9.  Back to cited text no. 8
9.Takata T, Miyauchi M, Ogawa I, Kudo Y, Takekoshi T, Zhao M, et al. Immunoexpression of transforming growth factor beta in desmoplastic ameloblastoma. Virchows Arch 2000;436:319-23.  Back to cited text no. 9
10.Medeiros Junior R, Queiroz IV, Correia AV, Vasconcelos BC, Gueiros LA, Leao JC, et al. Mandibular desmoplastic ameloblastoma: Case report. Gen Dent 2012;60:e109-13.  Back to cited text no. 10


  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8]

This article has been cited by
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