|Year : 2016 | Volume
| Issue : 2 | Page : 110-112
Central mucoepidermoid carcinoma of the mandible: A rare case report with diagnostic dilemma and review of the literature
Praveer K Banerjee, Abhineet Jain DLO, DNB , Sonam Rathi
Department of ENT and Head and Neck Surgery, JLN Hospital and RC, Sector-9, Bhilai, Chattisgarh, India
|Date of Submission||09-Aug-2015|
|Date of Acceptance||28-Aug-2015|
|Date of Web Publication||25-Apr-2016|
Department of ENT and Head and Neck Surgery, JLN Hospital and RC, Sector-9, Bhilai - 490 009, Chattisgarh
Source of Support: None, Conflict of Interest: None
Primary central mucoepidermoid carcinoma of jaws is a rare lesion comprising 2-3% of all mucoepidermoid carcinomas reported in the literature. It affects the mandible as unilocular or multilocular radiographic lesions.
The case presented here is that of a 55-year-old woman with expansile osteolytic lesion of the mandible who was managed with en-bloc resection considering ameloblastoma as preoperative diagnosis.
Mucoepidermoid carcinoma of the jaw is a rare tumour. The speculation on its aetiopathogenesis is mainly centered on the pluripotential capabilities of the epithelial lining of odontogenic cysts.
Keywords: intraosseous mucoepidermoid carcinoma, mandible, odontogenic epithelium
|How to cite this article:|
Banerjee PK, Jain A, Rathi S. Central mucoepidermoid carcinoma of the mandible: A rare case report with diagnostic dilemma and review of the literature. Egypt J Otolaryngol 2016;32:110-2
|How to cite this URL:|
Banerjee PK, Jain A, Rathi S. Central mucoepidermoid carcinoma of the mandible: A rare case report with diagnostic dilemma and review of the literature. Egypt J Otolaryngol [serial online] 2016 [cited 2020 Jan 21];32:110-2. Available from: http://www.ejo.eg.net/text.asp?2016/32/2/110/181086
| Introduction|| |
Mucoepidermoid carcinoma (MEC) is a commonly occurring malignant salivary gland neoplasm, comprising 2.8-15% of all salivary gland tumours. Aberrant salivary gland neoplasms arising in jaws as primary central bony lesions are extremely rare, comprising 2-4.3% of all MECs reported  . A thorough review of the English literature yielded about 100 reported cases of MEC arising in the mandible , .
| Case report|| |
A 55-year-old hypertensive woman attended the OPD with chief complaints of pain and swelling on the left lower jaw of 4 months' duration associated with intraoral swelling [Figure 1]. There was no associated trismus or loose tooth. Past history of extraction of lt. lower last two molars 10 years back was noted. On examination, the swelling was diffuse and bony-hard, involving the ramus and along the superior aspect of the angle of the mandible with expansion of the buccal and lingual cortices with crackling and bluish discolouration of the overlying mucosa [Figure 2] and no cervical lymphadenopathy. CT scan revealed a unilocular osteolytic expansile lesion involving ramus, coronoid process and sigmoid notch [Figure 3]. Fine needle aspiration cytology (FNAC) through an intraoral route was suspicious of ameloblastoma. Marginal mandibulectomy was performed. Histopathological examination revealed intraosseous MEC [Figure 4]. Postoperatively, the patient received 40 Gy of radiation in 20 fractions and doing well until 4 months of follow-up.
|Figure 2: Excised specimen with cortical expansion and bluish discolouration of the mucosa|
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|Figure 3: Computed tomography (CT) scan showing expansile osteolytic lesion at ramus and coronoid process|
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|Figure 4: HPE× slide showing nests of neoplastic squamous cells along with mucous secreting cells|
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| Discussion|| |
The first case of central mucoepidermoid carcinomas (CMEC) was reported in the mandible of a 66-year-old woman, by Lepp, in 1939. Waldron and Mustoe  suggested that intraosseous MEC be included in the primary intraosseous carcinomas of the jaws (PIOC) as type 4. PIOC was classified as follows  :
Its origin remains controversial and possibilities considered are as follows:
- Type 1, PIOC ex-odontogenic cyst.
- Type 2a, malignant ameloblastoma.
- Type 2b, ameloblastic carcinoma arising de novo, ex-ameloblastoma or ex-odontogenic cyst.
- Type 3, PIOC arising de novo:
- Keratinizing type and
- Nonkeratinizing type.
- Type 4, intraosseous MEC.
CMEC affects women twice more than it does men, with the majority occurring in fourth and fifth decades of life, and involves the mandible (the molar angle region) twice more often than the maxilla. In our case, the patient is female with involvement of the ramus and the molar angle region.
- Metaplasia of the odontogenic cyst epithelium;
- Entrapment of salivary tissues from the submandibular, sublingual or minor salivary glands and from the retromolar area during development
- Maxillary sinus epithelium,
- Iatrogenic entrapment of minor salivary glands (chronic osteomyelitis, sinusitis),
- Odontogenic remnants of dental lamina  .
The main symptoms are swelling and pain, with trismus, paraesthesia and tooth mobility being noted occasionally  . Previous history of a cyst or impacted tooth indicate towards neoplastic transformation to MEC  . The periphery of the lesion is mostly well-defined, corticated and often crenated or undulating in nature, which is similar to a benign odontogenic lesion  . The multilocular lesion resembles a soap bubble or honeycomb.
The clinical and radiographic differential diagnosis should include an odontogenic keratocyst, ameloblastoma, dentigerous cyst, ameloblastic fibroma and metastatic lesions to the jaw  .
Criteria for diagnosing CMECs include the following:
Brookstone and Huvos  had put forward a staging system based on condition of the overlying bone.
- Presence of a radiographic, distinct, osteolytic lesion;
- Positive mucicarmine staining;
- Absence of rupture of one or more cortical plates.
- Clinical and histological exclusion of a metastasis or an odontogenic lesion;
- Exclusion of the origin from a soft tissue salivary gland; and
- Histological confirmation  .
The case presented here showed expanded, eroded buccal and lingual cortices and could be imputed as stage III disease.
- Stage I disease: lesions with intact cortical plates with no bony expansion;
- Stage II disease: surrounded by intact cortical bone with some degree of expansion;
- Stage III disease: cortical perforation, breakdown of the overlying periosteum or nodal spread.
The primary treatment modality for patients with central intraosseous MEC is surgery. As a rule, even as low-grade tumours, MEC should be managed with wide local resection, en-bloc resection or hemimandibulectomy , or partial/total maxillectomy. Neck dissection is performed in cases where metastasis to the cervical nodes is suspected  . Adjuvant radiotherapy is recommended for high-grade tumours  .
| Conclusion|| |
CMEC in the jaws is a rare entity. The posterior part of the mandible is the common site. Surgery such as en-bloc resection is the treatment of choice with adjuvant radiotherapy in high-grade cases.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
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Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]