An Autopsy Case of Intimal Sarcoma of the Abdominal Aorta with Bone Metastasis and Lymph Node Metastasis: A Case Report and Review of the Japanese Literature
Abstract:A 73-year-old man complained of sternoclavicular joint pain; blood tests revealed elevated C-reactive protein. The patient developed delirium; magnetic resonance imaging showed metastatic bone tumors. He died two weeks after admission. Autopsy revealed abdominal aortic intimal sarcoma with metastasis to the peritracheal lymph nodes and sternum. Peripheral arterial embolism and bone metastasis are common symptoms of aortic intimal sarcoma, which implies a place for aortic intimal sarcoma in differential diagnos… Show more
Primary aortic sarcoma is a rare and aggressive malignancy with only approximately 190 cases reported in the literature. While angiosarcoma and intimal sarcomas represent an estimated 67.7% of malignant aortic tumours, spindle cell sarcomas are even more exclusive, consisting of only 0.9% of malignant aortic tumours. Differentiated from other malignant aortic tumours, spindle cell sarcomas are of mesenchymal origin and usually express vimentin and osteopontin. Clinical presentations are variable and nonspecific, ranging from back pain, abdominal pain or elevated blood pressure, misleading to differentials like pulmonary emboli or aortic aneurysms such as in our case here. In this article, we discuss the finding of an extremely rare aortic sarcoma masquerading as a pulmonary embolism. The patient underwent surgical resection; however, the course was complicated by the development of brain metastases and intracranial haemorrhage. The literature is expanding regarding the evolution of adjuvant chemotherapy and radiation therapy in the treatment of these patients. The exact pathogenesis of spindle cell sarcomas is unknown but thought to be related to the MDM2-p53 pathway. The development of spindle cell sarcomas may be related to Li-Fraumeni syndrome, which should be on the differential for these patients. This case highlights the importance of identifying aortic sarcomas in patients who present with signs and symptoms of peripheral embolization as the diagnosis can be easily misconstrued for thrombus or aortic aneurysm, leading to a delay in proper and timely management. We herein emphasize that aortic sarcomas should be included in the clinician’s working differential due to the poor prognosis and outcomes that these aggressive tumours carry.
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