Central Mucoepidermoid Carcinoma of Mandible: A Case Report

Nafise Shamloo, Nasim taghavi, Majid nemati, Yaser safi

American Journal of Medical Case Reports OPEN ACCESSPEER-REVIEWED

Central Mucoepidermoid Carcinoma of Mandible: A Case Report

Nafise Shamloo1,, Nasim taghavi1, Majid nemati2, Yaser safi3

1Oral & Maxillofacial Pathology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran

2Oral & Maxillofacial Surgery Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3Oral & Maxillofacial Radiology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran


Central mucoepidermoid carcinoma (CMC) is an uncommon tumor, comprising 2-3 % of all mucoepidermoid carcinomas reported. The majority of cases occurring in the 4th and 5th decades of life and they are histologically low-grade malignant neoplasm usually affecting the mandible. The case presented is a 41 year old woman with central mucoepidermoid carcinoma at the left posterior of the mandible as a swelling with purulent discharge since last year. Radiographic examination showed a radiolucent lesion with well-defined borders in distal area of ┌8.

Cite this article:

  • Nafise Shamloo, Nasim taghavi, Majid nemati, Yaser safi. Central Mucoepidermoid Carcinoma of Mandible: A Case Report. American Journal of Medical Case Reports. Vol. 3, No. 8, 2015, pp 235-238. http://pubs.sciepub.com/ajmcr/3/8/4
  • Shamloo, Nafise, et al. "Central Mucoepidermoid Carcinoma of Mandible: A Case Report." American Journal of Medical Case Reports 3.8 (2015): 235-238.
  • Shamloo, N. , taghavi, N. , nemati, M. , & safi, Y. (2015). Central Mucoepidermoid Carcinoma of Mandible: A Case Report. American Journal of Medical Case Reports, 3(8), 235-238.
  • Shamloo, Nafise, Nasim taghavi, Majid nemati, and Yaser safi. "Central Mucoepidermoid Carcinoma of Mandible: A Case Report." American Journal of Medical Case Reports 3, no. 8 (2015): 235-238.

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1. Introduction

Central mucoepidermoid carcinoma (CMC) is an uncommon tumor, consisting 2-3 % of all mucoepidermoid carcinomas reported. Lepp first reported an intraosseous mucoepidermod carcinoma (MEC) of the mandible in 1931 [1]. In 1991 the World Health Organization (WHO) suggested that the term “mucoepidermoid tumor” should be changed to mucoepidermoid carcinoma. A systemic review of its histology and degree of differentiation was also done in 1991 [2, 3]. The origin of the CMC is controversial and several possibilities have been considered, including: metaplasia of odontogenic cyst epithelium, entrapment of salivary tissue during embryonic development, maxillary sinus epithelium, iatrogenic entrapment of minor salivary glands and odontogenic remnants of the dental lamina [4, 5].

CMC has been reported in all ages ranging from 1 to 78 years, with the overwhelming majority occurring in 4th and 5th decades of life. They are histologically low-gradetumors, usually affecting the mandible as an unilocular or multilocular radiographic lesion [4, 6].

Here, we report a new case of central mucoepidermoid carcinoma within the mandible in a 41- year female.

2. Case Report

A 41-year-old woman was referred to a private oral surgery office for the diagnosis of manibular lesion. Chief complaint was swelling and purulent discharge at the posterior of left mandible since last year. The patient had received antibiotic during last year with diagnosis of infectious process. After antibiotic therapy, the size of the lesion has been decreased.

Her medical history was not significant. She denied smoking and any consumption of drugs or alcohol. Intra-oral examination revealed a lobular, blue purple mass with relatively firm consistency and tenderness, associated with lower lip paresthesia. Extra-oral examination showed no abnormality and face was bilaterally symmetrical. Cervical lymphadenopathy was absent.

Cone Beam Computed Tomography was taken by SCANORA 3D CBCT machine (SOREDEX, Helsinkey, Finland) with 7.5x10 cm field of view, 200 microns voxwl size, 90 KVP and 8 mA. On axial, cross sectional, panorama and 3D CBCT examination a radiolucent intra osseous lesion with well-defined but noncorticated borders could be detected in distal area of left third mandibular molar. Lesion caused a massive bone destruction in lingual plate of alveolar bone (Figure 1). Thining of mandibular canal roof was seen in cross sectional views (Figure 1). The lesion did not affect adjacent teeth. A provisional diagnosis of ameloblastoma and keratocystic odontogenic tumor was made.An incisional biopsy was done. The specimen was submitted to oral and maxillofacial pathology service and prepared for histologic examination with hematoxylin and eosin staining. Gross examination revealed one piece of irregular cystic creamy brown elastic tissue, measuring 2x 1.3 x 0.5 cm. Microscopically, sections showed a malignant salivary gland tumor composed of sheets, islands and cystic spaces lined by mucous and epidermoid cells with focally papillary projections in to the cystic spaces. Area of necrosis, hemorrhage and chronic inflammatory cells inflammation were evident. These findings suggested a diagnosis of intermediate grade of MEC.Then the patient underwent surgery and the lesion completely excised with wide surgical margins.

Figure 1. Axial, Cross sectional, Panorama and 3D CBCT images represent a well defined radiolucent lesion (white arrows) with perforation (white arrowheads) in the posterior area of left mandible
Figure 2. represents sheets of epidermoidcells(Black arrow) and mucouc cells (Red arrow)X200
Figure 3. represents an island of mucous cells with clear cytoplasm (Red arrows) surrounded by epidermoid cells x400

3. Discussion

On rare occasion ,salivary gland tumors arise centrally within the jaws.CMC is the best recognized intraosseous salivary gland tumor [7] which is predominantly seen in the mandible and affects females twice more than males [8, 9], similar to present case.

Eversole et al. found that approximately 50 % of the cases were associated with dental cyst and or impacted teeth [10]. The possibility of the origin of the CMC in our case may be embryonic remnants of the submandibular salivary gland within the mandibular bone which subsequently underwent neoplastic transformation [4].

The main symptoms are swelling , pain, trismus and parasthesia. Tooth mobility occasionally has been noted. Variability of radiographic features of CMC and its resemblance to other odontogenic cysts and tumors, emphasize that CMC should be considered in the differential diagnosis of radiolucent lesions of jaws. Radiographic feature of tumors usually show a well circumscribed uni/multilocular radiolucency [9]. In this case, CBCT images showed a well-defined but noncorticated borders radiolucency.

Criteria for diagnosis of CMC have been discussed by Alexander, Silvergade and Schultz and are as below[11]:

a) Presence of radiological evidence of bone destruction

b) Presence of an intact cortical plate

c) Absence of primary lesion in the salivary gland

d) Exclusion of a metastasis or an odontogenic tumor

e) Histologic confirmation

In this case, buccal cortical plate was intact and histologically was confirmed as intermediate MEC. Moreover, we excluded other possibilities such as metastases and odontogenic lesions.

Brookstone et al. in 1992, proposed a staging system based on the condition of the overlying bone. Lesions with intact cortical plates with no evidence of bony expansion offer the best prognosis and indicate stage I. Stage II is surrounded by intact cortical bone that has undergone some degree of expansion. Any instance of cortical perforation, breakdown of the overlying periosteum or nodal spread is best categorized clinically as stage III [12]. The presented case showed lingual cortical perforation which could be imputed as stage III disease. Metastasis has been reported in 9 % of intraosseous mucoepidermoid carcinoma primarily to the regional lymph nodes and infrequently to the ipsilateral clavicle, lung and brain [10, 12, 13].

Biopsy is necessary for the final diagnosis and treatment plan in all cases of CMCs.In contrast to our case, most of the reported cases are histologically low-grade and usually carry a favorable prognosis [9, 10]. As a rule, even being low-grade tumors, CMC should be treated by wide local resection or en bloc resection. CMC must be followed-up for long periods due to the possibility of late local recurrence or regional metastasis [14]. According to different reports the recurrence rate of CMC varies from 13-50 % which depends on the biologic behavior of tumor and surgical methods [9, 10].

In conclusion, CMC of the mandible is extremely rare malignant salivary gland neoplasm and the prognosis is related to histologic grade ,clinical stage and adequate resection of the tumor. Long-term follow-up is mandatory for the success of thee treatment ..


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