- Case report
- Open Access
Follicular lymphoma manifests as multiple erosive and proliferative lesions of the oral mucosa: case report and brief literature review
BMC Oral Health volume 22, Article number: 514 (2022)
Erosion is one of the most common and basic lesions of oral mucosal diseases. Long-term refractory oral erosions, induced by autoimmune blistering diseases, infectious diseases, malignant diseases, and some rare conditions, may substantially reduce the quality of life of patients or even constitute a life-threatening condition, resulting in a clinical dilemma regarding the accurate diagnosis and precise management of these diseases. As a special type of malignant lymphoma, most lesions of follicular lymphoma (FL) in the oral mucosa present as masses or swelling of the oral mucosa, while emerging novel presentations lead to intractable diagnoses. Hence, diagnostic algorithms for such diseases are clinically required.
A 55-year-old female patient presented to the clinic with long-lasting oral mucosal erosions and proliferative lesions. Blood tests, pathological examinations of oral lesions including haematoxylin–eosin (HE) staining, and direct immunofluorescence precluded all of the potential diagnoses described previously. Unexpectedly, positron emission tomography/computed tomography (PET/CT) and abdominal CT of the patient revealed a dense mass in the retroperitoneal area, and the final diagnosis of the retroperitoneal mass was FL. After three courses of chemotherapy conducted by the haematologist, the erosion and proliferative lesions in the patient's oral mucosa had significantly improved. HE and immunohistochemical staining results of intraoral lesions also confirmed it as oral FL. The successful diagnosis of FL in this case is of great clinical significance, as the oral and abdominal FL were treated in a timely manner to avoid unfavourable outcomes.
To the best of our knowledge, this is the first case of FL that exhibited widespread erosions interspersed with proliferative lesions. Clinicians should be aware of oral FL or seek systemic factors in the presence of similar refractory oral erosions when treatment is non-responsive and the diagnosis is intractable.
Oral mucosal diseases are characterised by their high incidence and wide extent of involvement. For example, the prevalence of recurrent aphthous ulcer (RAU) ranges from 5 to 25% , and the associated Behcet’s disease might involve other body sites besides the oral mucosa ; thus, oral mucosal lesions may serve as an indicator of systemic diseases. Erosions or ulcers are common manifestations and basic lesions of oral mucosal diseases, with erosions histologically presenting as partial defects of the mucosal epithelium and ulcers as defects of the entire epithelial layer. Oral mucosal diseases such as oral lymphoma may manifest as erosions and ulcers . Long-lasting erosions or ulcers may lead to severe distress and a significant decrease in quality of life, and in some cases, may even be life-threatening. For instance, long-term RAU or erosion poses a substantial threat to the quality of life of patients by causing difficulties with daily food intake or weight loss due to severe pain, repeated seeking of medical advice, and compelled consumption of various types of medicine including steroids, immunosuppressants, and even biologics such as intravenous immunoglobulins, thereby inducing serious physical and psychological pressure [4,5,6]. In addition, recalcitrant and complicated oral ulceration or erosions might represent a non-specific sign of malignancies with poor prognosis; for example, a one-month large palatal ulceration resistant to routine treatment was ultimately diagnosed as a presentation of NK/T-cell lymphoma, which has aggressive behavior and a poor outcome .
Apart from these common aetiologies contributing to oral erosions, such as oral lichen planus (OLP), a small proportion of persistent oral erosions may be oral manifestations of systemic diseases or other factors. In recent years, oral medicine clinicians and pathologists have faced emerging challenges owing to refractory and complicated oral erosions. First, regular inquiry of medical history and oral examination are insufficient to obtain the actual diagnosis of some challenging oral erosions. Second, the definite diagnosis of some non-specific oral signs may require biopsy, which must include normal-appearing tissue and have adequate depth in addition to diseased tissue, after which haematoxylin–eosin (HE), direct immunofluorescence (DIF), and immunohistochemistry (IHC) might be required to reveal the actual disease. Thus, the accuracy of the whole process is largely dependent on the experience of dental clinicians and oral pathologists. Third, besides the detection of biopsied lesions, some adjuvant examinations are recommended to identify systemic factors responsible for the oral erosions, encompassing computed tomography (CT), ultrasonography, blood testing, whole exome sequencing, and so forth. Finally, for refractory oral erosions that cannot be diagnosed through the aforementioned measures, multi-disciplinary team consultation, diagnostic treatment, and further biopsy may be required to achieve an adequate diagnosis [3, 7,8,9].
A large number of oral mucosal diseases can be characterised by oral mucosal erosion, including oral allergic diseases , oral infectious diseases such as tuberculosis (TB) , pemphigus/pemphigoid , paraneoplastic autoimmune multiorgan syndrome (PAMS) , oral potentially-malignant disorders (OPMD) represented by OLP , oral malignancies including oral squamous cell carcinoma (OSCC) , and genetic diseases such as dyskeratosis congenita  (Table 1). These diseases may be distinguished from each other based on various features, such as the clinical duration and medical history, and by engaging diagnostic approaches, including examination of biopsied tissue and systemic adjuvant examination.
We recently reported a woman with multiple refractory and scattered oral erosions accompanied by several proliferative and nodule-like lesions who had failed to respond to conventional treatment regimens (low-dose oral prednisone with dexamethasone mouthwash) and was finally diagnosed with oral manifestations associated with abdominal follicular lymphoma (FL) after a multidisciplinary consultation. FL is a lymphoid tissue systemic malignancy that exhibits germinal center B B-cell differentiation, and a small proportion of patients with FL might have poor outcomes . Non-Hodgkin’s lymphomas (NHL) is a special type of lymphoma which frequently involves the head and neck region, and about 20–25% of NHL are diagnosed as FL . Orally, FL typically presents as masses or swelling of the oral mucosa, which is a non-specific presentation among oral mucosal diseases, thus triggering difficulties and complexities in diagnosis . The final diagnosis of this case was made through a combination of the clinical manifestations, thorough medical history enquiry, radiographic examination, multi-disciplinary cooperation, and pathological findings, exemplifying the diagnostic logistics of such complicated cases. To the best of our knowledge, this is the first case report of secondary FL presenting as widespread erosive and proliferative lesions in the oral mucosa, which might serve as a significant reminder in our future clinical practice.
A 55-year-old woman presented to our oral medicine clinic with refractory and recurrent erosions of the oral mucosa persisting for more than 2 years. Her condition had gradually worsened over the past 6 months, with almost no healing period for the oral erosions. The patient complained of severe and obvious pain after eating irritating food. Upon clinical inspection, a region of erosion with a surface area of 40 mm × 20 mm was observed on the dorsum of the tongue, interspersed with several proliferative or nodule-like lesions with diameters ranging from 4 to 6 mm. The height of nodules was about 5 mm above the mucosal level, which was palpated and considered to be of moderate texture (Fig. 1A). Linear or reticular white striae accompanied by erosions and hyperaemia were observed on the right angle of the mouth, inner mucosa of both lips, bilateral tongue margins, and the lower part of the buccal mucosa (Fig. 1B, C, and D). The whole gingiva was hyperaemic and eroded along with shallow vesicles. The Nikolsky sign was positive, and the tongue was flexible and soft, which is the same for typical oral mucosa. Overall, periodontal hygiene was poor. In addition, enlarged lymph nodes were palpated in both mandibular regions, and the lymph nodes in the left mandibular region were relatively fixed without pain upon touching. A history of hypertension and a surgery for total hysterectomy were recorded upon medical history enquiry, and no drug allergy was revealed.
In terms of potential diagnosis, given the atypically widespread and refractory erosions on the oral mucosa, autoimmune blistering diseases, special infections such as human immunodeficiency virus (HIV) and syphilis, OLP, or malignant lesions, came up as the initial impression based on our clinical experience. Next, several examinations were suggested to achieve the diagnosis, including routine blood tests, glucose tests, biochemical tests, bullous disease antibodies against Dsg1, Dsg3, and Bp180, and testing for HIV and syphilis; negative findings were indicated in these tests. Furthermore, chest computed tomography (CT), abdominal ultrasonography, and biopsy of the inner mucosal lesions of the right upper lip were performed.
Meanwhile, the patient required medication during the process of receiving further tests. This course included 30 mg of prednisone per day for one week, 50 mg of thalidomide per day for 10 days and 0.1 mg/mL dexamethasone mouthwash; however, no significant recovery of the oral erosions and proliferative lesions was observed at the revisit, which emphasized the complexity of the disease and the potential systemic nature. For the biopsy, the inner-side mucosa of the right upper lip was selected because of the co-existence of erosion and white striae, which was not visibly present on the tongue. After HE staining, nodular aggregation of lymphocytes and plasma cells was observed in the subepithelial connective tissue and around the blood vessels under a microscope (Fig. 2A). The DIF test for diagnosing bullous disease showed negative results for IgA, IgG, IgM, and C3. In addition, chest CT was negative. However, positron emission tomography/computed tomography (PET/CT) of the patient, which was further suggested, provided a surprising clue. Specifically, the inspection showed increased metabolism in the salivary glands, an enlarged liver and spleen, and multiple hypermetabolic lymph nodes throughout the body. In addition, significantly thickened soft tissue was observed in the retroperitoneal area on abdominal ultrasonography, which encapsulated the abdominal aorta and mesenteric vessels, and an abundant blood supply was observed. All the above signs indicate haematologic disease in the retroperitoneal area. After visiting the haematology department, pathological examination of the patient's retroperitoneal mass revealed FL grade I-II and stage IV, and the patient was categorised into the intermediate-risk group, with the FL international prognostic index (FLIPI) score defined as 2. In order to investigate whether the intraoral lesion was related to lymphoma in the abdomen, the tissue sample from the upper lip mucosa was further stained by IHC, which showed follicular-like structures presenting as CD20 ( +) and B-cell lymphoma 2 (BCL-2) ( +), while the staining for CD10, CD5, and CD3 was negative, and CD21, CD23, and follicular dendritic cells (FDC) were positive (Fig. 2B-D). Thus, in light of the masses in the retroperitoneal area and HE together with IHC results of the oral tissue, the diagnosis of oral involvement by FL was finally made upon multidisciplinary discussion.
The patient was then referred to haematology department for further treatment of FL, and 0.1 mg/mL dexamethasone together with 2% sodium bicarbonate mouthwash was recommended for topical treatment of oral lesions. After meticulous evaluation by a haematologist, the patient was treated with a rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) regimen as follows: rituximab 500 mg D0, vinorelbine 30 mg D1, pirarubicin 60 mg D1, cyclophosphamide 1 g D1, hydrogenated prednisone 40 mg D1, D5. Over three courses of chemotherapy, the intraoral lesions improved significantly, the nodule-like lesions on the dorsum of the tongue disappeared, and the oral erosions were also controlled. The patient was then recommended routine visits to the haematology clinic every 2 months, and no further recurrence of oral lesions was observed in the follow-up visits until May 2022 (the third year after the onset of disease) (Fig. 3).
Discussion and conclusions
Here, we report a case of long-lasting refractory erosions in the oral mucosa for more than 2 years, which was finally diagnosed as oral manifestations of FL. Although the diagnosis process had consumed tremendous time and effort, the patient received appropriate treatment.
As shown in Table 1, there are several common diseases in which long-term oral erosion might present as the main manifestation, including autoimmune blistering diseases such as pemphigus vulgaris and pemphigoid, acquired immune deficiency syndrome (AIDS), syphilis, OPMD such as OLP, and oral malignant lesions (Table 1). Autoimmune blistering diseases may present with bullous lesions in the oral mucosa, or manifest as large areas of irregular erosive and hyperaemic lesions following the rupture of the bulla [11, 15], the diagnosis of which is mainly dependent on HE and DIF results of lesions [16, 17]. To diagnose AIDS and syphilis, which may also present with non-specific oral erosions, blood tests for specific antibodies may be recommended [19, 21]. In terms of OPMD, the intraoral manifestations of OLP generally include symmetrical white striae interspersed with irregular erosions [23, 24]. Discoid lupus erythematosus may be characterised by erosions surrounded by radial white striae, commonly seen in the lower lip . Oral leucoplakia, or oral erythroplakia, is primarily characterised by white or scarlet patches accompanied by persistent erosions, and histological examination is essential for the ultimate diagnosis of OPMD [25, 33]. In addition, oral malignant lesions, predominantly represented by OSCC, tend to present as localized ulcers with a firm texture on their margins upon palpation. The tongue is the most frequently involved site for these ulcers . Based on the features of the pathological examination and blood test results, all of the above diagnoses could be excluded for this patient.
Additionally, some relatively rare diseases may mimic the form of multiple intraoral persistent erosions, including paraneoplastic pemphigus (PNP) or PAMS , oral infections such as TB , haematopoietic and lymphoid neoplasms including Langerhans cell histiocytosis (LCH) , genetic diseases represented by dyskeratosis congenita , and pyostomatitis vegetans (PSV) . PNP, also known as PAMS, is a lethal autoimmune disease associated with tumours such as thymoma. Because multiple organs may be involved, the term PAMS has been proposed to fully reflect the clinical manifestations and immunopathological features of the disease [9, 18, 35]. Clinically, PAMS manifests as erosions or bulla of the skin, and mucous membranes might be demonstrated . In line with pemphigus, the diagnosis of PAMS also relies on HE and DIF [12, 36]. Therefore, a diagnosis of PAMS was excluded. Oral TB can also manifest as recalcitrant ulcers or erosions with irregular margins, for which typical Langerhans giant cells viewed under the microscope and the presence of TB DNA upon quantitative polymerase chain reaction (qPCR) are the dominant features [3, 22]; therefore, oral TB was eliminated from this case. Haematopoietic and lymphoid malignancies containing LCH might also be characterised by erosions . HE, IHC, and blood tests are important clues for diagnosis. Additionally, genetic diseases such as dyskeratosis congenita can also show similar features , for which whole-exome sequencing is an indispensable diagnostic marker, in addition to biopsy of the lesion. Moreover, PSV, as a relatively specific sign of inflammatory bowel disease (IBD), can also present as proliferative pustular lesions and subsequent erosions in the oral mucosa , the diagnosis of which largely depends on clinical presentation, peripheral eosinophilia, and histological characteristics . Notably, proliferative lesions displaying nodule-like or granular-like forms might be observed in the erosive lesions of oral diseases such as oral TB , syphilis [20, 37], pemphigus vegetans , lymphoma , OSCC , and PSV ; therefore, these diseases cannot be ignored as potential diagnoses when oral erosions are accompanied by proliferative lesions.
Based on the features of the aforementioned diseases and the systemic findings, the oral presentations of the patient and differential diagnosis were made, and the ultimate conclusion was oral manifestations of FL, one of the most frequent NHL. In Western countries, FL accounts for approximately 5% of all haematologic neoplasms and about 20–25% of all newly diagnosed NHL . Up to 40% of NHL were identified at extranodal sites, of which the head and neck region is the second most involved site of extra-nodal lymphomas . However, primary lymphomas of the oral cavity are very rare, accounting for only 3% of all lymphomas in the general population . According to a study by Barone S et al., the most commonly involved sites are in the soft tissues of oral cavity, with an incidence rate presenting as 38.4%, 19.2%, and 11.5% for buccal mucosa, tongue and gingiva . As for the clinical appearance, lymphoma occurring in the gingiva, buccal mucosa, and palate usually manifests as ulceration (Table 2) [39, 45,46,47,48,49,50,51,52,53,54,55,56], while that of FL has been discussed above, and masses or nodular lesions may be observed or palpated under the mucosa of the palate, buccal, and tongue [39, 45, 50, 51, 57,58,59,60]. Swelling of the lip, palate, gingiva, or buccal mucosa may serve as alternative oral signs of lymphoma [61,62,63,64]. Meanwhile, accompanying symptoms such as enlargement of multiple superficial lymph nodes in the head and neck region and mucosal necrosis have also been reported . To the best of our knowledge, this is the first report of oral manifestations of FL exhibiting widespread erosion interspersed with proliferative lesions in the oral mucosa. However, it seems difficult to judge whether the initial site of manifestation of the FL was in the oral mucosa or in the retroperitoneal area, based on the medical history of this case.
The pathogenesis of FL that leads to oral mucosal erosion and proliferative lesions is unknown. However, this process may be associated with the tumour immune microenvironment. In FL, the tumour microenvironment is one of the main contributors to tumour cell survival and proliferation. These important components of the microenvironment, such as follicular germinal centers, helper T cells, macrophages, and FDCs, play crucial roles in the formation of oral FL lesions . In FL with poor prognosis, the functional genes of FDC were relatively overexpressed, and the helper T cells were functionally active, producing various cytokines such as IL-2, IL-12, and IFN-γ . Thus, the abnormal activity of these immune cells and overexpression of cytokines may be responsible for the onset of oral mucosal lesions.
Based on the diagnostic process of this particular case and the logistics of differential diagnosis, we have summarised a flowchart of the diagnostic algorithm for patients with refractory oral erosions (Fig. 4), thus ensuring a fast and accurate diagnosis for patients presenting in oral medicine clinics.
The clinical manifestations of intraoral FL are mostly masses or swelling of the oral mucosa . This case serves as the initial report of FL presenting as scattered erosions and proliferative lesions in the oral mucosa. Upon receiving patients with widespread and refractory oral mucosal erosions, the common diagnosis of OLP, autoimmune bullous disease, HIV, and syphilis should be initially considered, and PAMS, oral TB, LCH, genetic diseases, and PSV should also be evaluated. If all these are excluded, accompanied by the ineffectiveness of the conventional treatment, clinicians should be aware of systemic malignancies such as FL.
Availability of data and materials
Acquired immune deficiency syndrome
B-cell lymphoma 2
Discoid lupus erythematosus
Follicular dendritic cell
Follicular lymphoma international prognostic index
Human immunodeficiency virus
Inflammatory bowel disease
Langerhans cell histiocytosis
Oral lichen planus
Oral potentially malignant disorders
Oral squamous cell carcinoma
Paraneoplastic autoimmune multiorgan syndrome
Positron emission tomography/computed tomography
Quantitative polymerase chain reaction
Recurrent aphthous ulcer
Rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone
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We would like to thank the pathological assistance from all staffs at the Department of Oral Pathology in West China Hospital of Stomatology from Sichuan University.
This work is supported by National Natural Science Foundation of China (81902782, 82002888, 81730030), Research Funding from West China School/Hospital of Stomatology Sichuan University(No.RCDWJS2022-16), the CAMS Innovation Fund for Medical Sciences(CIFMS, 2019-I2M-5–004), the 14th special grant from China Postdoctoral Science Foundation (2021T140484) and the 69th general grant from China Postdoctoral Science Foundation (2021M692267). All of these funding bodies played no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
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Wu, Y., Zhang, Y., Li, C. et al. Follicular lymphoma manifests as multiple erosive and proliferative lesions of the oral mucosa: case report and brief literature review. BMC Oral Health 22, 514 (2022). https://doi.org/10.1186/s12903-022-02567-7
- Follicular lymphoma
- Erosive and proliferative lesions
- Oral manifestation
- Case report