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Patients with malignant tumors are susceptible to concurrent venous thromboembolism. We report two cases of glioblastomas that showed asymptomatic pulmonary embolism and deep vein thrombosis on admission. The first case was a 77-year-old male. He was referred to our clinic for a tumor found in the left temporal lobe on computed tomography scan performed when he suffered pneumonia. On admission,he had a Karnofsky performance status (KPS) score of 50 and an elevated D-dimer level (16.46 μg/ml). Pulmonary embolism and deep vein thrombosis were noted on detailed examination. Direct oral anticoagulant (DOAC) therapy resulted in the disappearance of pulmonary embolism. On biopsy,the tumor was diagnosed as glioblastoma. The patient underwent radiation therapy in combination with chemotherapy. The second case was a 71-year-old female. She developed a disorder of consciousness and was admitted to a clinic. Brain magnetic resonance imaging (MRI) revealed a high T2 signal area in the left temporal lobe. The patient was initially diagnosed with encephalitis. Though the consciousness disorder improved quickly,she was referred to our clinic after a hyperintense area was observed on MRI. On admission,she had a KPS score of 100,and an elevated D-dimer level (7.59μg/ml),revealing pulmonary embolism and deep vein thrombosis. She was started on a DOAC and underwent surgical removal of the tumor via craniotomy. She was diagnosed with glioblastoma and underwent radiation therapy in combination with chemotherapy. Approximately 20% of the patients with glioblastomas suffer concurrent symptomatic venous thromboembolism. The incidence of venous thromboembolism is further elevated in patients with a poor KPS score or elderly people. Many patients with glioblastomas suffer asymptomatic venous thromboembolism. In this report,asymptomatic venous thromboembolism was noted in patients with a good KPS score. In glioblastoma patients,it is necessary to test for venous thromboembolism by measuring D-dimer levels before surgery.

COT-18 TWO CASES OF GLIOBLASTOMA WITH ASYMPTOMATIC PULMONARY ARTERY EMBOLISM AND DEEP VEIN THROMBOSIS FROM ADMISSION TO HOSPITAL