Pulmonary thromboembolism can lead to shock or sudden death depending on the degree of obstruction, and the life prognosis is poor in severe cases. Here, we describe a case of pulmonary thromboembolism found during treatment for oral ulcer due to severe diabetes. A man in his 60s was referred to our department because of oral ulcer-induced pain. An ulcer with necrotic tissue was observed on the left tongue and gingiva of the left mandibular molar. A blood test revealed high blood glucose levels of 254mg/dL and HbA1c 10.2%, so we consulted with the Department of Diabetic Endocrinology. Subsequently, diabetic ketosis was observed, so he was admitted to the hospital for treatment. Pulmonary thromboembolism was found on chest and abdomen contrast computed tomography images taken after admission, so he was transferred to the Department of Cardiology. Deep vein thrombosis was also observed, so thrombolytic therapy was performed after placement of the femoral vena cava filter, and he was discharged at 30days after admission. In the oral lesion, after debridement of the necrotic tissue under glycemic control, epithelialization of the wound was gradually observed. The final examination was performed 48days after the initial examination.
