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\textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt \textcolor{GJBlue}{\large\bfseries\abstractname\space} }{% \vskip8pt \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt } \usepackage[absolute,overlay]{textpos} \makeatother \usepackage{lineno} \linenumbers \begin{document} \author[1]{Dr. Mahesh M.S} \affil[1]{ Farooqia Dental College and Hospital} \renewcommand\Authands{ and } \date{\small \em Received: 14 December 2013 Accepted: 1 January 2014 Published: 15 January 2014} \maketitle \begin{abstract} The calcifying odontogenic cyst (COC) accounts for about 1% of all the jaw cysts, found most commonly within the bone. The lesion shows extreme diversity in its clinical, radiological and histopathological features as well as in its biological behavior. In addition, the calcifying odontogenic cyst may be associated with other odontogenic tumors, most commonly odontoma. Calcifying odontogenic cyst associated with Ameloblastoma and Adenomatoid Odontogenic Tumor has also been reported1. Here we present a case of a 29 year old male patient with a large COC associated with an impacted 38 and involving the left body and angle of mandible with diverse clinical and radiological appearance. \end{abstract} \keywords{calcifying odontogenic cyst; diverse clinical, radiological and histological presentation; odontogenic tumors; calcifying cystic odontogenic tumor.} \begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) \textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark} \end{textblock*} \begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) \textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}} \end{textblock*} \let\tabcellsep& \section[{Introduction}]{Introduction}\par alcifying odontogenic cyst (COC) was first described as a distinct clinicopathologic entity by Gorlin et al., in 1962. Ever since then controversy and confusion have existed regarding its nature \hyperref[b1]{2} . According to the WHO classification in 2005, COC has now been reclassified as calcifying cystic odontogenic tumor (CCOT). The lesion shows extreme diversity in its clinical and histopathological features as well as in its biological behavior. CCOTs are frequently associated with odontogenic tumors, a finding which is a rare event in other types of odontogenic cysts or tumors {\ref 3, 4, 5, 6, 7, 8.} Central and peripheral forms of calcifying odontogenic cyst occur equally in the upper and lower jaws. Johnson et al reported the occurrence of 60\% of the tumors in mandible, 30\% in the form of peripheral calcifying odontogenic cysts and anterior part of the jaw was involved in 53\% of cases9. On the basis of 52 examples of calcifying odontogenic cysts associated with an odontoma Hirschberg et al concluded that the upper jaw was affected in 61.5\% and the anterior region of the jaw in 75\% of the reported cases \hyperref[b8]{10} .\par Calcifying cystic odontogenic tumor can occur in very young patients, even in the first year of life.\par Cases have also been recorded of patients in their eighties \hyperref[b9]{11} . However, in the majority of cases it occurs in the second decade of life \hyperref[b10]{12,}\hyperref[b11]{13} .\par CCOT may clinically be diagnosed as Ameloblastoma, Calcifying epithelial odontogenic tumor, Adenomatoid odontogenic tumor, Ameloblastic fibroodontoma, complex or compound odontoma and dentigerous cyst or as other types of odontogenic cysts.\par A hybrid odontogenic tumour composed of a calcifying cystic odontogenic tumour (CCOT), a solid multicystic ameloblastoma (A-S/M) and an Adenomatoid odontogenic tumour (AOT) was reported in the anterior part of the mandible of a 64-year-old Chinese woman 5 . This further confirms the diverse histopathologic presentation of the tumor. \section[{II.}]{II.} \section[{Case Report}]{Case Report}\par A 29-year-old male patient visited the department of oral medicine and radiology of Farooqia Dental College and Hospital, with a chief complaint of swelling in the left side of face since 7 months. Swelling which started gradually increased to attain the present size. No history of pus, blood or watery discharge, color change or parasthesia noted over the swelling. No history of difficulty in opening the mouth, speaking and swallowing food. History of difficulty in chewing the food from affected side. No history of pain and any other associated symptoms like fever, loss of appetite, loss of weight, diarrhea or fatigue. Patient gave history of noticing mobility of teeth in the region of complaint since 4 months.\par On local extraoral examination, a solitary ill defined oval swelling measuring about 4 X 5 centimeters is present over the left body and angle of mandible. Superiorly the swelling extends from 1 cm below the zygomatic arch to 1 cm beyond the lower border of the mandible. Anteriorly, the swelling extends from 1cm distal to the angle of mouth to the ramus of mandible posteriorly. The skin over the swelling is stretched with obliteration of the Nasolabial fold. There is no evidence of pus, blood or watery discharge and no secondary changes were noted. The surrounding area appears normal.\par Intraoral hard tissue examination revealed Grade I mobility i.r.t {\ref 35} and Grade III mobility i.r.t {\ref 36,} {\ref 37} . On Soft tissue examination vestibular obliteration and tenderness present i.r.t {\ref 34,} {\ref 35,} {\ref 36,} {\ref 37} . Color of the mucosa appeared normal with no sinus opening noted over the vestibule. No evidence of ulcer or growth noted in the soft tissue. Buccal and lingual cortical plate expansion with perforation of the buccal cortical plate was present.\par The orthopantomograph revealed a multilocular radiolucency on the left side of the mandible extending from the periapical region of first premolar up to the angle of mandible. The lesion contained the unerupted third molar displaced distally near the angle of mandible. Resorption of the apical 1/3rd of the root of 35 and apical and middle 1/3rd of the mesial and distal roots of 36 and 37 was evident. There was break in the continuity of lower border of mandible without any pathological fracture.\par Based on history, clinical features and radiographic appearance, a differential diagnosis of Ameloblastoma, Keratocystic Odontogenic Tumor, Calcifying Cystic Odontogenic Tumor and Odontogenic myxoma was considered.\par An incisional biopsy was obtained from the lesion to establish the final diagnosis. Histopathologic examination revealed epithelial lining consisting of tall columnar basal and superficial stellate reticulum like cells along with areas of eosinophilic ghost cells suggestive of Calcifying cystic odontogenic tumor. \section[{III.}]{III.} \section[{Discussion}]{Discussion}\par CCOT represents 2\% of all the odontogenic pathological changes of the jaws, although it can be found in isolation, it is usually associated with other odontogenic tumours, most frequently with odontoma in 24\% of the cases \hyperref[b13]{15} .\par According to few studies CCOT is more common in females and in maxilla where as there are reports of CCOT occurring more in males and in mandible \hyperref[b14]{16} .Cases have also been reported where Calcifying cystic odontogenic tumor is provisionally diagnosed as a residual cyst \hyperref[b13]{15} as well as a periapical pathology \hyperref[b15]{17} .\par Radiographically, they are clearly delineated and appear as unilocular or multilocular radiolucencies. Scattered irregular sized calcifications producing a mixed radiopaque radiolucent lesion may also be encountered, which may coalesce later and give an appearance of tooth like densities within the lesion \hyperref[b1]{2,}\hyperref[b11]{13} .\par COC can occur alone or in association with other odontogenic tumors such as odontomas (20\%), adenomatoid odontogenic tumors and ameloblastomas.\par However, this association is a challenge for diagnosis using only conventional images, due to the presence of numerous over lapped images of anatomical structures of the maxillofacial region. Root resorption and divergence of roots of the associated teeth are common radiographic findings, and an association with an impacted tooth occurs in approximately one-third of cases \hyperref[b16]{18} . This further suggests the diverse radiographic presentation of CCOT.\par The present case occurred in a 29 year old male and is in the mandibular left posterior teeth region associated with an impacted tooth.\par It demonstrated a gradual increase in size of the swelling with associated mobility of teeth and was found to be much larger measuring 3x7 cm which is in contrary to what has been reported.\par Expansion of the labial or buccal cortical plate invariably occurs usually sparing the lingual cortical plate.\par The reported case here is unusual to what has been published in literature since lingual cortical expansion was noted along with perforation of the buccal cortical plate and resorption of lower border of mandible without any evidence of pathological fracture.\par In conclusion, the diverse clinical and radiological presentation of calcifying odontogenic cyst makes it difficult to diagnose clinically. Calcifying cystic odontogenic tumor (CCOT) is an uncommon odontogenic tumor.\par Although rare, because of its variable presentation calcifying cystic odontogenic tumor should be included in the differential diagnosis of jaw lesions. involving calcifying cystic odontogenic tumor and plexiform Ameloblastoma. Contemp Clin Dent. 2013 Jul-Sep; 4(3):406-408. 5. Zhang W et al. A case report of a hybrid odontogenic tumour: Ameloblastoma and adenomatoid odontogenic tumour in calcifying CCOT was first described in 1932 by Rywkind who reported a lesion of the jaw which resembled cholesteatoma of the ear and thereafter called it as cholesteatoma of the jaw. In 1946, Thoma and Goldman described a lesion which they called a strange variant of ameloblastoma. It was in 1962 that Gorlin first described it {\ref 2, 3, 14 .} \backmatter \begin{bibitemlist}{1} \bibitem[Chaubey et al.]{b3}\label{b3} \textit{A rare presentation of hybrid odontogenic tumor}, S S Chaubey , S S Mishra , S S Degwekar , S Chaubey . \bibitem[Biradar ()]{b6}\label{b6} ‘Ameloblastoma arising in calcifying odontogenic cyst: A rare histologic variant’. V G Biradar . \textit{Int J Head Neck Surg} 2012. 3 (2) p. . \bibitem[Menat et al. ()]{b2}\label{b2} \textit{Ameloblastomatous CCOT: A Case Report of a Rare Variant of CCOT with a Review of the Literature on Its Diverse Histopathologic Presentation. Case Reports in Dentistry}, S Menat , M D Shylaja , K Attur , K Goyal . 2013. \bibitem[Cury et al. ()]{b10}\label{b10} ‘Calcifying Cystic Odontogenic Tumor : Case Report’. S E Cury , S N Cury , M Cury , A Calderoni , V D Fajardo , M R Carvalho , L A Luderer . \textit{Webmed Central ORAL MEDICINE} 2011. 2 (12) p. C002583. \bibitem[Atun and Carnate ()]{b5}\label{b5} ‘Calcifying Cystic Odontogenic Tumor Associated with a Complex Odontoma’. Jml Atun , J M Carnate . \textit{Philipp J Otolaryngol Head Neck Surg} 2013. 28 (2) p. . \bibitem[Vasudev (2012)]{b11}\label{b11} \textit{Calcifying cystic odontogenic tumor-a unique developmental lesion arising in mandible}, S Vasudev . 2012 Jan-Apr. Health Renaissance. 10 p. . \bibitem[Manveen et al. (2010)]{b13}\label{b13} ‘Calcifying Cystic Odontogenic Tumour Mimicking As a Residual Cyst’. J K Manveen , R V Simmerpreet , S V Ramandeep , NS . \textit{Journal of Clinical and Diagnostic Research} 2010 Aug. 4 p. . \bibitem[Thinakaran et al. ()]{b9}\label{b9} ‘Calcifying ghost cell odontogenic cyst: A review on terminologies and classifications’. M Thinakaran , P Sivakumar , S Ramalingam , N Jeddy , S Balaguhan . \textit{J Oral Maxillofac Pathol} 2012. 16 p. . \bibitem[Hirshberg et al. (1994)]{b8}\label{b8} ‘Calcifying odontogenic cyst associated with odontoma: a possible separate entity (odontocalcifying odontogenic cyst)’. A Hirshberg , I Kaplan , A Buchner . \textit{J Oral Maxillofac Surg} 1994 Jun. 52 (6) p. . \bibitem[Balaji and Rooban ()]{b15}\label{b15} ‘Calcifying odontogenic cyst with atypical features’. S M Balaji , T Rooban . \textit{Ann Maxillofac Surg} 2012. 2 p. . \bibitem[Johnson et al. (1997)]{b7}\label{b7} ‘Calcifying odontogenic cyst: A clinicopathologic study of 57 cases with immunohistochemical evaluation for cytokeratin’. A Johnson , M Fletcher , L Gold , Chen Sy . \textit{J Oral Maxillofac Surg} 1997 Jul. 55 (7) p. . \bibitem[Extra Oral Photograph Opg Showing The Multilocular Radiolucency Cropped Image Of The Opg Histopathologic Section -20x Magnification]{b17}\label{b17} \textit{Extra Oral Photograph Opg Showing The Multilocular Radiolucency Cropped Image Of The Opg Histopathologic Section -20x Magnification}, \bibitem[Aswath et al. ()]{b4}\label{b4} ‘Odonto calcifying cyst’. N Aswath , K Mastan , T Manikandan , G Samuel . \textit{Contemp Clin Dent} 2013. 4 (1) p. . \bibitem[Reichart and Philipsen ()]{b1}\label{b1} \textit{Odontogenic tumors and allied lesions}, P A Reichart , H P Philipsen . 2004. p. . (London: Quintessence) \bibitem[Neville et al. ()]{b0}\label{b0} \textit{Oral and maxillofacial pathology}, B W Neville , D D Damm , C M Allen , J E Bouquot . 2009. St. Louis: Saunders. p. . (3rd ed.) \bibitem[Gorlin et al. ()]{b12}\label{b12} ‘The calcifying odontogenic cyst -A possible analogue of the cutaneous calcifying epithelioma of Malherbe’. R L Gorlin , J J Pindborg , F Clausen , R A Vickers . \textit{Oral Surg Oral Med Oral Pathol} 1962. 15 p. . \bibitem[Buchner (1991)]{b16}\label{b16} ‘The central (intraosseous) calcifying odontogenic cyst: an analysis of 215 cases’. A Buchner . \textit{J Oral Maxillofac Surg} 1991 Apr. 49 (4) p. . \bibitem[Habibi et al. ()]{b14}\label{b14} ‘Thirty years clinicopathological study of 60 Calcifying cystic odontogenic tumors in Iranian population’. A Habibi , N Saghravanian , J Salehinejad , H Jafarzadeh . \textit{J Contemp Dent Pract} 2011. 12 (3) p. . \end{bibitemlist} \end{document}