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Methotrexate-associated lymphoproliferative disorder (MTX-LPD) is an iatrogenic immunodeficiency-associated lymphoproliferative disorder that occurs mainly with MTX use. This disorder has been associated with Epstein-Barr virus (EBV) infection. In 2017, the WHO newly defined the disease concept of EBV-positive mucocutaneous ulcer (EBV-MCU) as a good-prognosis EBV-related disease. Here, we report 10 cases of MTX-LPD or EBV-MCU in the oral mucosa. This retrospective, observational study was conducted with MTX-LPD or EBV-MCU in the oral mucosa patients who visited us during the nine year period from 2012 to 2021. We gathered the basic information, underlying disease, histopathological evaluation, treatment and prognosis for the subjects. All were being treated with MTX for rheumatoid arthritis. EBV infection was positive in all cases by immunohistochemistry. A complete or partial response was obtained in all cases with the withdrawal of MTX. Our results suggests that the most common risk factor for developing EBV-MCU is the use of immunosuppressive drugs. The most common site of onset is the oral mucosa, which may be attributed to the mode of EBV infection and the high incidence of chronic irritation of the oral mucosa. A small number of patients had been diagnosed with MTX-LPD, but we consider that these cases were EBV-MCU based on our study.

Highlights • The patient was a 59-year-old man presenting with a swollen right submandibular gland. Laboratory tests revealed IgG4 levels of 176 mg/dl (reference range: 4.8–105). • Histological examination of the submandibular gland showed an adenoid cystic carcinoma with lymphocytic infiltration containing many IgG4-positive plasma cells in the tumor stroma., Introduction Immunoglobulin G4-related disease (IgG4-RD) is an inflammatory condition associated with elevated serum IgG4 levels and tissue infiltration by IgG4-expressing plasma cells. We present a case of adenoid cystic carcinoma (ACC) of the submandibular gland with possible involvement of IgG4-RD. Presentation of case The patient was a 59-year-old man presenting with a swollen right submandibular gland. Laboratory tests revealed IgG4 levels of 176 mg/dl (reference range: 4.8–105). An initial open biopsy for histological diagnosis showed chronic sialadenitis. The region was monitored on an outpatient basis, and finally the right submandibular was totally resected because malignant tumor could not be excluded. Histological examination of the submandibular gland showed an ACC with lymphocytic infiltration containing many IgG4-positive plasma cells in the tumor stroma. Discussion We have described a case that indicated a possible involvement of ACC with IgG4-RD. This allows us to speculate that longstanding IgG4-RD may progress to malignancy or infiltration of IgG4-positive plasma cells through the signals of tumor stimuli. Further investigations are required to determine the potential pathogenic mechanism underlying this unique tumor. Conclusion This case underscores that caution is needed in the diagnosis of masses with high serum IgG4 levels, as the differential diagnosis includes malignancy.

Background: According to the report of Japan’s Ministry of Health, Labor and Welfare, looking at the main reasons requiring nursing care by age group, elderly people aged 75 and over, falls and fractures increase. The purpose of this study was to investigate the trends and characteristic features of maxillofacial fractures in over 75 years old, late stage of elderly patients. Patients and Methods: Records of patients who were treated for maxillofacial fractures at the Oral and Maxillofacial Surgery department (Biopathology) of Okayama University hospital from January 2008 to December 2013 were retrospectively analyzed. Clinical records were analyzed in terms of age, gender, etiology, relevant medical history, and anatomical site of fracture. Patients (n=103) were divided into two groups by age

Objective: In recent years, the need for dental treatment and dental hygiene management within the perioperative period and supportive advanced medical treatment has been increasing. However, perioperative intervention in diseases requiring oral surgical treatment is not well understood at present. Here we report our investigation of diseases requiring oral surgical treatment in which Department of Oral and Maxillofacial Surgery (Biopathology) at Okayama University Hospital conducted medicaldental cooperation via Division of Hospital Dentistry. Methods: In the five years from April 2011 to March 2016, we have identified 310 cases that reached the Okayama University Hospital Department of Oral and Maxillofacial Surgery (Biopathology) via the Division of Hospital Dentistry. Results: The patients were treated in 22 clinical departments, the most prevalent treatment was chemotherapy, followed by surgery and then transplantation. The surgical diseases for which our department was consulted were most commonly diseases of the teeth and periodontal disease (269 cases), followed by inflammatory conditions such as implantitis and osteomyelitis, and mucosal diseases such as lichen planus and leukoplakia. The surgical procedure performed was most often tooth extraction (243 cases); there are few cases of cystectomy and sequestrum. In the majority of cases, the surgical treatment was performed on the initial examination day; in about 84% of cases, surgery was performed within 2 weeks. Conclusion: Further investigation is necessary into the practice of preventing adverse events non-dental medical departments by increasing the frequency of oral surgical intervention in appropriate cases during the perioperative period.

Highlights • The management of medication-related osteonecrosis of the jaw (MRONJ) is controversial. • To date, there is no established treatment for cases of advanced stage 3 MRONJ osteoporosis in elderly patients. • We describe a case in which a pathological mandible fracture induced by MRONJ was healed and functional recovery of the occlusion was obtained by complete dentures after treatment with teriparatide., Introduction The management of medication-related osteonecrosis of the jaw (MRONJ) is controversial. To date, there is no established treatment for cases of advanced stage 3 MRONJ osteoporosis in elderly patients. Presentation An 87-year-old osteoporotic woman with osteonecrosis-induced left mandible fracture related to minodronate therapy was referred to us for treatment. She had a vertebral compression fracture concurrently and had started subcutaneous injection of teriparatide. After 18 months of treatment with teriparatide the pathological mandible fracture was healed and functional recovery of the occlusion was obtained by complete dentures. Discussion Teriparatide may have a powerful anabolic effect on bone, and promote bone regeneration against pathologic mandible fracture induced by MRONJ. Conclusion Based upon these findings, teriparatide might be beneficial for advanced stage 3 MRONJ osteoporosis in elderly patients.