하악골에서 발생한 Burkitt 림프종의 조기발견과 진단


Burkitt 림프종은 소아에서 호발하는 악성 종양의 하나로 non-Hodgkin B 림프종의 한 형태이다. 매우 빠르게 증식하는 종양으로 구강 내에서 발생시 안면부 부종 및 이환 치아의 동요도와 변위, 치은의 발적 및 부종 등의 증상을 보인다.
본 증례는 5세 남환으로 왼쪽 하악부의 통증과 안면부 부종으로 개인병원에서 의뢰되었다. 왼쪽 하악골부터 관골까지 퍼진 안면부 부종을 보였으며 좌측 하악 유구치는 심한 충치가 없음에도 불구하고 중등도의 동요도를 보이고 타진에 양성 반응을 보였다. 방사선학적 소견으로는 좌측 하악 제2유구치와 제1영구치의 치조 백선 소실이 관찰 되었으며, 좌측 하악골에는 방사선 투과성의 골용해성 소견과 피질골의 파괴가 관찰되었다. 환아는 임상적, 방사선학적, 면역조직학적 검사를 바탕으로 Burkitt 림프종으로 진단되었고, 전신적인 검사와 항암 화학요법을 위해 본원 소아과로 의뢰되었다. 화학요법을 시작한 지 3개월만에 안면부 및 치은의 부종이 소실되었고, 치아의 동요도 및 위치도 정상으로 회복되었다.
Burkitt 림프종으로 진단된 본 환아는 조기 진단과 집중적인 화학요법으로 좋은 예후를 보였기에 이를 보고하는 바이다.


Burkitt lymphoma (BL) is an aggressive form of non-Hodgkin’s B-cell lymphoma found primarily in the pediatric population. In the oral cavity, this tumor can grow rapidly and often brings about facial swelling or development of an exophytic mass involving the jaws.
A 5-year-old boy was referred for swelling and pain in the left mandibular area. The patient showed diffuse swelling on the left side of the mandible and firm-moderate tenderness upon palpation. An intraoral examination showed moderate mobility and sensitivity to percussion on the left primary first and second molars, without severe caries. A radiographic examination revealed complete loss of the lamina dura on the left primary second molar and permanent first molar. There was a radiolucent osteolytic lesion and destruction of the cortical bone of the left mandibular body. Based on the clinical, radiographic, and immunohistochemical findings, the patient was diagnosed with BL, and was referred to a pediatrician for systemic evaluation and intensive chemotherapy. Even before the completion of chemotherapy, the swelling resolved and the displaced teeth were relocated to a normal position.
This patient showed a good prognosis due to prompt diagnosis and intensive chemotherapy. Early diagnosis and referral for treatment can prevent the development of BL.

Ⅰ. Introduction

In 1958, Denis Burkitt [1] published the first report of Burkitt lymphoma (BL) - derived from facial and abdominal lesions in young African children. BL is an aggressive form of non-Hodgkin’s lymphoma (NHL), consisting of high-grade, diffuse, small, non-cleaved B-lymphocytes. The affected age group for BL is children and young adults [2].
BL may present as one of several types: endemic, sporadic, or immunodeficiency-associated. The endemic (African) type almost always occurs in children and involves the jaws in 50-70% of cases. Jaw lesions in the endemic type form at the age of 3 years in close to 100% of known cases. In contrast, jaw lesions are less frequent in the sporadic (American) type and presentation of this type is almost always associated with abdominal complications [2]. Children diagnosed with sporadic BL are typically older than children suffering from the endemic type. Furthermore, the incidence of BL also increases among patients with various immunodeficiencies, such as HIV infection [3].
The clinical presentation of BL is characterized by rapid progression with multifactorial extranodular involvement. Within the jaws, BL is associated with loosening and extrusion of the involved teeth, premature shedding of primary teeth, swelling of alveolar regions, gingival enlargement, pain, and jaw expansion [2,4].
The primary treatment of BL is intensive combination chemotherapy. BL is almost always curable via chemotherapy and the prognosis is excellent for those diagnosed during the early stages of the disease, with survival rates of 85-95% [3,5].
This study reports a 5-year-old boy with BL and discusses the clinical, radiological, and immunohistochemical findings of BL. This case report will demonstrate the importance of early diagnosis, prompt referral, and aggressive management of BL.

Ⅱ. Case Report

A 5-year-old boy was referred to the department of pediatric dentistry with the chief complaint of swelling in the left lower jaw lasting for 7 days. The patient had a history of pain on the same side for 30 days. The patient’s mother reported that the local clinician had attributed pain to the eruption of the left mandibular first molar and recommended a wait-and-see approach. However, sudden and very marked swelling prompted the mother to visit a larger hospital.
Clinical examination revealed that the boy was in good general health and had no allergic reaction to food or medicine. An extraoral examination showed diffuse swelling in the left mandibular area, from the level of the zygoma to the lower border of the mandible. The surface of the swelling appeared smooth and erythematous (Fig. 1A). The patient showed firm-moderate tenderness upon palpation, but no discharge was noted. Also, the left lower primary first and second molars had moderate mobility and sensitivity to percussion. The patient was in a mixed dentition state with the left mandibular permanent first molar partially erupted, but the other first molars had not erupted. The intraoral soft tissue on the left lower posterior area appeared solitary, lobulated, and erythematous, and the swelling mass had an irregular surface (Fig. 1B). The patient had moderate oral hygiene and no severe caries.
The radiographic examination included panoramic and periapical radiographs (Fig. 2). The left lower primary second and permanent first molars showed complete loss of the lamina dura. In the left mandibular area, a radiolucent osteolytic lesion and destruction of cortical bone were evident. The results of this examination indicated malignancy and further evaluation was necessary to identify the disease. Additional examinations including computed tomography (CT) of the facial bone and bone scintigraphy (Fig. 3). CT showed an osteolytic lesion with cortical bone destruction and regionally enlarged lymph nodes. Bone scintigraphy was performed after intravenous (IV) injection of 99mTc hydroxyethylene diphosphonate (HDP) (20 mCi). A photon defect in the mandible was observed and the bone scan ruled out osteosarcoma.
An incisional biopsy was also performed with the cooperation of an oral surgeon under IV sedation since the patient was anxious; an electrosurgical generator (Force FX™-8C; Valleylab, Boulder, CO) was used for the biopsy and soft tissue was resected from the left mandibular vestibule (0.8 × 0.8 × 0.4 cm). For the final diagnosis, the specimen was examined by a pathologist, and analyzed chemically (Fig. 4). Routine hematoxylin and eosin stained sections showed diffuse infiltration of atypical medium-sized lymphoid cells into the skeletal muscle (Fig. 5A). Immunohistochemically, the neoplastic cells were positive for LCA (CD45), CD20, Bcl-1, and CD10, and negative for Bcl-2 and terminal deoxynucleotidyl transferase (TdT). The Mib-1 proliferation rate was almost 100% (Fig. 5B). These features confirmed the presence of high-grade NHL of Burkitt’s type.
The patient was referred to the pediatrics department for further systematic evaluation. A pediatrician performed additional examinations including abdominal CT, bone marrow aspiration, chromosomal analysis, and cytological examination of cerebrospinal fluid. These analyses indicated that the tumor had not spread to other organs. After insertion of a Hickman catheter, the patient received intensive chemotherapy based on methotrexate and cyclophosphamide. After 3 months of chemotherapy, the extraoral and intraoral swelling had resolved completely and percussion sensitivity and mobility of the affected teeth had decreased (Fig. 6). The radiographic examination showed bone regeneration and recovery of a normal trabecular pattern, and the displaced teeth had relocated to a normal position (Fig. 7). Chemotherapy was planned for 10 months and was finished at the time of writing (Fig. 8).
The patient was recalled at 3-month intervals to evaluate caries and the eruption of the permanent teeth. The left mandibular first permanent molar and primary molars had caries limited to the enamel portion and the permanent tooth to erupt was the right and left mandibular first permanent molar. Therefore, topical fluoride application was performed periodically during eruption period. Caries treatment was delayed until the end of chemotherapy.

Ⅲ. Discussion

About 10% of malignant tumors occurring in children younger than 15 years of age are lymphomas, and 60% of lymphomas developing in children are NHLs. BL is a form of NHL with distinct epidemiological, clinical, pathological, immunological, and molecular cytogenetic characteristics [2]. The tumor arises through the malignant monoclonal proliferation of early B-lymphocytes, and has a mean potential doubling time of 25.6 h. Thus, BL is known as the most rapidly dividing tumor [6].
Denis Burkitt [7] noted the geographic distribution of the tumor and suggested that it may be induced by an insect-vectored agent, such as a virus. The discovery of virus particles in cultured lymphoblasts of BL by Epstein [8] in 1964 demonstrated that the cause of BL was, in fact, Epstein-Barr virus (EBV). The majority of patients with endemic BL had the EBV genome and a characteristic pattern of viral gene expression [9]. In African BL, early EBV infection appears to be the initiator and malaria the promoter. The prevalence of EBV is also intermediate in non-African BL types. In nonAfrican countries, there is no evidence of malaria, but EBV-positive BL occurs, suggesting that EBV and malarial infection are not necessary and sufficient causes of BL [10]. Other factors, such as poor nutrition, zinc deficiency, and other infectious diseases may be relevant in EBV-positive BL, and EBV has also been identified in 25-40% of immunodeficiency-associated cases [2,11]. In America, EBV DNA was found in about half of BL cases presenting with AIDS [12]. Although there are strong relationships between BL and EBV, the exact role of EBV in the pathogenesis of BL has not been clearly demonstrated. EBV is associated with 95% of African BL cases, but only 20% of BL cases in Europe and America. These findings suggest that EBV is not essential for the occurrence of BL [2]. Various studies into the etiology of BL have been attempted but have failed to identify clear genetic or environmental factors. Arboviruses and plant tumor promoters are other possible local cofactors, and overexpression of the c-myc oncogene and the functional loss of wild-type p53 gene have also been implicated as possible etiologic factors [11,13].
There are several differences between endemic (African) and sporadic (non-African or American) BL. The mean age of occurrence for endemic cases is approximately 7 years, while sporadic cases occur in older children (11-15 years) [14]. BL is found in almost all organs and the sites primarily involved are the head, neck, and abdominal areas. In sporadic BL, the most common site of presentation is the abdomen, whereas the head and neck are most commonly involved in endemic BL. The percentage of patients with jaw involvement is relatively low in non-endemic BL (12.5-16% of cases), whereas jaw involvement occurs in 60-70% of endemic cases. Furthermore, the mandible is more commonly involved in sporadic BL, but the maxilla is affected more often in endemic BL [14]. The sporadic type occurs worldwide, except in Africa. Therefore, this case could be the sporadic type based on region, while the patient’s age and position of occurrence were similar to the endemic type. The characteristics of the tumor cells, their natural history and prognostic features are similar regardless of the type of BL [2,15]. Therefore, it is difficult to determine whether this case was the endemic or sporadic type.
The clinical signs and symptoms of BL involving the jaws include facial swelling, alveolar and gingival expansion, tooth loss, premature eruption of permanent teeth, dental and jaw pain, and paresthesia [16]. Loss of the lamina dura is observed around erupted or developing teeth, as well as widening of the periodontal ligament, enlargement of dental crypts, displacement of the maxillary antrum, and radiolucencies and osteolytic foci of the jaw in the radiographic findings [16,17]. In this case, clinical signs such as toothache-like pain and facial deformity due to rapid facial swelling and radiographic evidence of floating teeth and loss of the lamina dura were observed.
The clinical presentation of BL is similar to that of many common disorders of the jaws. The differential diagnosis of BL should include acute dentoalveolar abscess, osteomyelitis, rhabdomyosarcoma, periapical lesions, ameloblastoma, eosinophilic granuloma, multiple myeloma, leukemia, and other fibro-osseous lesions. Histological features can assist in distinguishing between BL and other oral diseases. Histological sections have a characteristic ‘starry sky’appearance, which is caused by the proliferation of immature, undifferentiated B-lymphocytes with high nuclear to cytoplasmic ratios, interspersed with macrophages that contain cellular debris [4]. A classic immunophenotype is also diagnosed in approximately 94% of BL. The characteristic BL immunophenotype includes B-cell antigen expression, such as CD20, PAX5, CD19, CD22, and CD79a, with strong CD10 expression, and a very high proliferation rate based on Ki-67 or Mib-1 (cellular markers for proliferation). BL does not express TdT and is usually negative for Bcl-2. This patient had these characteristics and was diagnosed with BL [18]. Serological evidence of EBV is unreliable as a diagnostic aid, given that EBV was apparent in 6 to 98% of BL patients [4].
Dental radiographs can also play an important role in the diagnosis of BL, as changes in radiographs may precede apparent clinical signs. However, some of the changes, such as loss of the lamina dura, widening of the periodontal ligament, and the presence of osteolytic foci are not distinctive characteristics of BL and may appear in other malignant tumors or infections [16]. Therefore, diagnosis may be confounded by other diseases of the oral cavity, particularly dental infection, which is a common complaint in dental clinics. Saribans et al. [19] reported on 16 patients with American-type BL with jaw involvement. Of these, 14 cases were first evaluated by dentists and 10 were treated with antibiotic therapy or dental extractions for a presumed tooth infection. Symptoms originating from a dental infection respond to antibiotic treatment, but those of oncological origin do not improve with antibiotic treatment. As in the case described here, rapid and accurate diagnosis is critical for a favorable prognosis. Thus, it is important for dentists to understand the clinical characteristics of BL of the jaw and include it in their working differential diagnosis.
BL is one of the first human malignancies to be cured by chemotherapy alone. Clinical regression of the tumor is usually achieved within 2 weeks and odontogenesis resumes after successful chemotherapy [17]. BL treated with intensive chemotherapy has a good prognosis with a 5-year survival rate of 78% [14]. When the disease is confined to the head and neck, patients can expect tumor-free survival for at least 2 years in up to 90% of cases, with current chemotherapy regimens. However, patients with extensive disease, such as involvement of the bone marrow or CNS and those with HIV-associated BL, show lower survival rates [17,20]. Relapses usually occur within 1 year of diagnosis and patients who survive 2 years without recurrence can be considered cured [21]. Although 95% of patients achieve an initial complete remission following chemotherapy, up to 67% of patients relapse [22]. Nkrumah et al. [23] reported that 52% of patients with initial complete remission relapsed over an observation period ranging from 2 years to over 5 years. Relapse was common in patients who initially presented with abdominal or CNS involvement, while patients who had facial bone involvement had a much lower recurrence rate.
Chemotherapy is based on intravenous cyclosporine, vincristine, doxorubicin, methotrexate, and leucovorin; combination therapy is superior to single-agent chemotherapy. The use of multiple agents maximizes intensity while minimizing kinetic failures and may decrease the chance of drug resistance. Most chemotherapy regimens are cyclophosphamide-based [20] and common protocols for BL treatment include the COMP, BMP, LMB86, CODOX-M, and IVAC regimens [24]. However, chemotherapy has injurious effects on developing teeth. The worst consequences are seen in the treatment of children younger than 5-6 years; children younger than 12 years also exhibit later changes in tooth development. The dental abnormalities seen after chemotherapy include hypomineralization of the enamel, arrested root development, microdontia, and aplasia or delayed development of the permanent teeth [25,26]. Dental caries are the most commonly reported late dental effects following chemotherapy. Therefore, regular preventive dental care, such as individualized dental procedures and oral hygiene plans, is needed to improve post-chemotherapy dental outcomes [27]. This patient underwent regular dental check-ups to evaluate the development and eruption of the permanent teeth and caries.
Treatment success depends on the extent of the disease. Otmani et al. [28] reported that 54% of BL patients were considered long-term survivors, with survival rates of 100%, 91%, and 27% respectively, for Murphy’s tumor stages II, III, and IV (Table 1) [29]. In another study, the prognosis was excellent for those diagnosed during the early stages of the disease (I, II), with event-free survival rates of 85-100%. In the advanced stages (III, IV), the survival rate was 75-85% [2]. Other factors affecting prognosis are the patient’s age and the timing of diagnosis [13]. Thus, the best prognosis is achieved with BL stage I, and it is important that general dental practitioners, who are usually the first point of contact, know the characteristics of this disease and can diagnose it quickly and accurately. Dentists should suspect BL when faced with a patient with unexplained hypermobile teeth, the displacement of unerupted teeth, severe alveolar bone destruction on radiophotographs, or unexplained paresthesia. In the maxillofacial region, radiographs including both periapical and panoramic views are usually sufficient for the diagnosis of malignant lesions [13]. Thus, when a patient with these signs or symptoms presents, the dentist should refer the patient promptly to a specialist.

Ⅳ. Summary

This case report describes BL in the lower jaw of a 5-year-old male patient. BL is a NHL of B-cell origin with aggressive growth characteristics that requires early diagnosis and treatment. The clinical presentation of BL in the jaws include the loosening and extrusion of teeth, premature eruption of permanent teeth, gingival enlargement, swelling of facial and alveolar bones, dental pain, and paresthesia. As is typical with BL, the patient showed facial and gingival swelling, dental pain, and premature eruption of a permanent molar. The radiographic findings were typical of malignant disease. A biopsy was conducted to determine the diagnosis. This patient was diagnosed with BL, based on the clinical, radiographic, and immunohistochemical analyses, and showed a good prognosis due to prompt diagnosis and intensive chemotherapy. Regular check-ups are also needed to monitor dental developmental abnormalities and dental caries following chemotherapy.

Fig. 1.
Initial photographs. (A) Extraoral photograph showing facial swelling on the left mandibular area from the level of the zygoma to the lower border of the mandible. (B) Intraoral photograph showing premature eruption of the left permanent first molar and a solitary, lobulated, and erythematous swelling in the left lower posterior area.
Fig. 2.
Initial radiographs. (A) Panoramic radiograph showing radiolucent osteolytic lesion and the destruction of cortical bone in the left mandibular area. (B) Periapical radiograph showing complete loss of the lamina dura of the left mandibular primary second molar and permanent first molar.
Fig. 3.
(A) Computed tomography (CT) of the facial bone showing an osteolytic lesion and cortical bone destruction. (B) Bone scintigraphy showing a photon defect in the mandible.
Fig. 4.
(A) Incisional biopsy of the left mandibular posterior area. (B) Soft tissue resected by incisional biopsy.
Fig. 5.
(A) Histological examination. The diffuse infiltration of atypical medium sized lymphoid cells into the skeletal muscles. (Original magnification × 400) (B) Immunohistochemical stains. Mib-1 staining showing positive in almost 100% of cells. (Original magnification ×400)
Fig. 6.
Photographs after 3 months of chemotherapy. (A) Extraoral photograph showing completely resolved swelling in the left mandibular area (B) Intraoral photograph showing resolved gingival swelling.
Fig. 7.
Radiographs after 3 months of chemotherapy. (A) Panoramic radiograph showing normal trabecular pattern and teeth relocated to a normal position in the left mandibular area. (B) CT of facial bone showing cortical bone regeneration in the left mandibular area.
Fig. 8.
Images obtained after 11 months of chemotherapy. (A) Extraoral photograph. (B) Intraoral photograph. (C) Panoramic radiograph. (D) Facial bone CT.
Table 1.
Murphy's tumor staging [29]
Stage Criteria for extent of disease
Stage I A single tumor (extranodal) or involvement of a single anatomical area (nodal), with the exclusion of the mediastinum and abdomen.
Stage II A single tumor (extranodal) with regional node involvement.
Two or more nodal areas on the same side of the diaphragm.
Two single (extranodal) tumors, with or without regional node involvement on the same side of the diaphragm.
A primary gastrointestinal tract tumor (usually in the ileo-cecal area), with or without involvement of associated mesenteric nodes, that is completely resectable.
Stage III Two single (extranodal) tumors on opposite sites of the diaphragm.
Two or more nodal areas above and below the diaphragm.
Any primary intrathoracic tumor.
Any paraspinal or epidural tumor, whether or not other sites are involved.
Stage IV Any of the above findings with initial involvement of the CNS, bone marrow, or both.


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