|Year : 2014 | Volume
| Issue : 2 | Page : 251-255
Ewing's sarcoma of maxilla: A rare case report
Deepak Kumar Jairamdas Nagpal, Prashant Ramesh Prabhu, Sangeeta Jayant Palaskar, Swati Patil
Department of Oral Pathology and Microbiology, Sinhgad Dental Collge and Hospital, Pune, Maharashtra, India
|Date of Submission||02-Nov-2013|
|Date of Acceptance||30-Jun-2014|
|Date of Web Publication||17-Sep-2014|
Deepak Kumar Jairamdas Nagpal
Reader, Department of Oral and Maxillofacial Pathology, Sinhgad Dental College and Hospital, Pune - 411 041, Maharashtra
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Ewing's sarcoma is uncommon malignancy of childhood, frequently involving the mandible. The occurrence in maxilla is rare. It is histopathologically characterized by sheets of round cells positive for CD99. Although the prognosis is poor but early diagnosis and long term follow up can improve the survival.
This article presents a rare case of Ewing's sarcoma of maxilla in a 15 year old male patient showing excessive fibro-osseous response which is not a frequent presentation. A retrospective analysis of cases of Ewings sarcoma of maxilla published in the English litreture is reviewed. In our case, diagnosis was confirmed by immunohistochemistry where sheets of round tumor cells were positive for CD 99. Ewings sarcoma of maxilla is a rare and aggressive tumor. Hence early diagnosis, combined therapy and long term follow up is suggested in such cases.
Keywords: CD99, Ewing′s sarcoma, fibro-osseous, round cells
|How to cite this article:|
Jairamdas Nagpal DK, Prabhu PR, Palaskar SJ, Patil S. Ewing's sarcoma of maxilla: A rare case report. J Oral Maxillofac Pathol 2014;18:251-5
|How to cite this URL:|
Jairamdas Nagpal DK, Prabhu PR, Palaskar SJ, Patil S. Ewing's sarcoma of maxilla: A rare case report. J Oral Maxillofac Pathol [serial online] 2014 [cited 2019 Nov 18];18:251-5. Available from: http://www.jomfp.in/text.asp?2014/18/2/251/140769
| Introduction|| |
Ewing's sarcoma (ES) is a primary neoplasm of the skeletal system, first described by James Ewing in 1921.  ES is the second most common bone cancer, most often occurring in Caucasian children, adolescents and young adults. It is considered a high-grade malignancy. The neoplasm is thought to arise from immature reticulum cells or primitive bone marrow cells. The current reports have suggested the role of mesenchymal stem cells (MSC) in Ewing tumor proliferation.  Its occurrence in head and neck region is less frequent and majority of them are found in mandible as compared to maxilla.  This article describes a case of 15-year-old boy with ES of maxilla.
| Case report|| |
A 15-year-old male patient reported with a chief complaint of swelling on right side of face, gradually increasing in size. Episodes of epistaxis were also associated with the enlargement. Swelling was insidious in onset. There was no relevant medical or family history or a history of trauma. On physical appearance there was gross facial asymmetry with a well-circumscribed swelling measuring about 8 × 5 cm, on the right cheek. Movements of the eye were restricted exhibiting decreased width of palpebral fissure. Acuity of vision was not altered.
Intraorally a well-circumscribed, non-ulcerated, pinkish-red swelling was noticed extending from upper right canine to maxillary tuberosity with obliteration of maxillary vestibule. On palpation the swelling was non tender, slightly lobulated and bony hard in consistency. It was non-pulsatile and noncompressible. The swelling was associated with grade II mobility of the teeth from canine to second molar of the right side.
Considering the patient's history and clinical observation following procedures were carried out.
- Radiographs and Computed Tomography (CT) scan
- Hematological and Biochemical investigations
- An incisional biopsy.
An OPG showed lytic lesion with focal areas of opacification in right maxilla and nasal cavity. In addition, septal deviation with lateral nasal wall erosion, opacification of right maxillary sinus and loss of lamina dura with displacement of roots of first and second premolars were also noted.
Computed tomography scan
It showed an expansile lytic lesion of maxilla and nasal cavity involving the alveolus and hard palate with erosive borders. Posterolateral and anterolateral walls of the right maxillary sinus showed cortical break and extension into the infratemporal, temporal, buccal and facial tissues. Cortical breach was observed in the superior and medial walls of the sinus. Overall the radiographic findings were suggestive of malignancy.
Hemoglobin: 14.2%, total count-8200 cell/mm 3 , ESR-18MM, Bleeding time (Dukes method)-1 minute 50 seconds, Clotting time (Lee and White method): 5 minutes 20 seconds, differential count : n0 eutrophils-88%, lymphocytes-10, eosinophils-01, monocytes-01%. HIV, HbsAg was found to be negative by ELISA (tridot and rapid kit respectively).
Using semiautomatic analyzer (Star 21 Plus) Serum Glutamic Oxaloacetic Transaminase, Serum Glutamic-Pyruvic Transaminase, Potassium, Sodium, Calcium, Creatinine and serum alkaline phosphatase were analyzed and found to be within normal range.
Using a sub labial incision, biopsy was performed and sent to our department for examination. The hematoxylin and eosin stained section showed infiltration of proliferating lesional cells with varying amount of reactive fibro-osseous proliferation [Figure 1] and [Figure 2]. The tumor cells were in the form of aggregates of round darkly staining cells showing vacuolated cytoplasm and uniform nuclei with evenly dispersed chromatin.
The tumor cells showed membrane positivity for CD 99 [Figure 3] and [Figure 4] and were negative for Pan Cytokeratin [Figure 5], leukocyte common antigen, desmin [Figure 6] and synaptophysin [Figure 7]. These features were conclusive of Ewing's sarcoma.
An extended maxillectomy [Figure 8] was performed including hard palate till midline. The resected specimen also showed similar histopathological finding with anterior, posterior, medial, lateral and superior margins positive for the lesional cells. Three weeks, postoperatively, the patient was referred for radiation and chemotherapy.
|Figure 1: Photomicrograph showing sheets of proliferating round cells. (H&E stain, ×100)|
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|Figure 2: Photomicrograph showing peripheral reactive fibro-osseous proliferation. (H&E stain, ×400)|
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|Figure 3: Lesional cells showing strong positivity for CD 99. (IHC stain, ×100)|
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|Figure 4: Lesional cells showing strong positivity for CD 99. (IHC stain, ×400)|
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|Figure 5: Lesional cells negative for pan cytokeratin>. (IHC stain, ×400)|
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After a follow up period of one year the patient did not reveal any evidence of recurrence. But at three year follow up patient was noticed with multiple metastatic lesions primarily involving the lungs. Soon the patient died of the disease.
| Discussion|| |
After osteosarcoma, ES/Peripheral Neuro-Ectodermal Tumor (PNET) is the second most frequent primary malignant tumor occurring in bone. However, it is rare for ES/PNET to be found in the head and neck region. , PNET is a rare malignant tumor of ES family of tumors which include ES, PNET and Askins tumor.  ES and PNET share a common karyotype translocation t(11;12) (q24;q12). PNET is thought to be arising from soft tissues and ES in bone. Both ES and PNET share a high level of expression of the CD99 antigen (MIC-2 gene product). Because of these findings many investigators now believe that ES and PNET belong to same spectrum of tumors with different morphological patterns. ,, Approximately 4% of Ewing's sarcoma cases have arisen in the bones of head and neck with 1% occurring in the jaws. When the jaws are involved it frequently involves the mandible than maxilla. ,[ 6],[ 7],[ 8],[ 9] Out of 9 cases analyzed with Ewing's sarcoma of maxilla, 6 were seen in males and 3 in females with a male to female ratio of 2:1 [Figure 9]. The median age of the patient was 17 years. A painful swelling was the most common presentation. The majority of patients had a average tumor size of 6 × 4 cm. ,,,,,,, [Figure 10]. Out of these cases, one case presented with a history of trauma.  Its common presentation is localized growth which may be associated with pain and paresthesia. Lesions of maxilla are frequently associated with epistaxis as was seen in our case. , The lesion is predominantly seen in children and young adults. It has characteristic radiographic picture described by some authors as "onion skin appearance" especially in the long bones, but such pattern is less commonly seen in lesions of jaws. , Similar findings were observed in our case wherein lytic lesion was observed and the characteristic onion skin appearance was not evident. With respect to teeth, some of the radiological features noted include periodontal space widening, loss of lamina dura, root resorption, displacement or more commonly destruction of unerupted tooth follicles. MRI is considered to be an important tool to determine the extent of the lesion and for monitoring the effects of chemotherapy on the tumor. , Ewing's sarcoma is composed of uniform small, round, undifferentiated tumour cells with round or oval nuclei exhibiting a fine chromatin pattern, small nucleoli and scanty cytoplasm usually crowded in sheets or segregated in lobules by fine fibrovascular septa.  The intracytoplasmic glycogen may be demonstrated by PAS stain in 75% of the cases, but it is not pathognomonic and conclusive because other small round cells may show the presence of glycogen as well. Since Ewing's sarcomas are usually vascular; hemorrhagic areas and extensive necrosis are common. ,, It is rare to see extensive reactive bone formation as was seen in our case, which may be in response to the neoplastic cells, making it difficult to differentiate from round cell osteosarcoma. Histopathologically the tumor must also be differentiated from other small round cell tumor such as mesenchymal chondrosarcoma, rhabdomyosarcoma, malignant lymphoma, eosinophilic granuloma, neuro-endocrine tumors and metastatic neuroblastoma. , The use of immunohistochemistry has helped in the diagnosis of this tumor.  In general, the tumor cells are positive for vimentin and CD99 and negative for neural, skeletal, vascular and lymphoid cell markers. ,, Regarding Mic-2 antigen, recently published data have confirmed the high sensitivity of the Mic-2 gene product (CD99) for all ES family tumors with over 95% of the cases showing positivity for this marker. 
|Figure 10: Data of Ewing's sarcoma cases obtained from the English literature|
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Both ES/PNET are no longer considered a distinct entity because of histological and molecular similarities. More than 90% show a clear translocation t (11; 22) (q24; q12) resulting from the fusion of EWS and FLI gene. The gene rearrangement causes a fusion product which functions as an oncogene aberrant transcription factor with structural variability and potential prognostic impact. The neuroepithelial differentiation is varied, Ewing's sarcoma shows a minimum degree of differentiation and PNET shows obvious degree of differentiation. ,
Ewing's sarcoma is a radiosensitive tumour.  Multimodality therapy consisting of an initial biopsy, aggressive combination of surgery, chemotherapy and localized radiotherapy is the treatment of choice for Ewing's sarcoma of the head and neck region and may result in long-term survival.  The prognosis of ES is poor because hematogenous spread and lung metastases occur within a few months after diagnosis, although the tumor burden is considered today as an important factor of prognosis. ,,, Systemic disease is the most important predictive factor towards disease-free survival followed by the clinical response to chemotherapy. 
| Conclusion|| |
We have described a rare case of ES of maxilla showing excessive fibro-osseous response which is not a frequent presentation. Because of its high metastatic potential, the patient died after four years. Therefore ES demands early intervention. Evaluation of lesion using plain radiographs, CT, MRI, biopsy followed by histopathology and immunohistochemistry are necessary for early diagnosis.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9], [Figure 10]