On (b)(6) 2020, the patient underwent a filter implantation procedure.On (b)(6) 2020, a ct scan found no abnormality in the patient.On (b)(6) 2020, the patient complained of back pain.A ct scan revealed a retroperitoneal hematoma.Whether perforation occurred or not was unknown because an angiography was not performed.There are no external factors found which might cause perforation, and the influence of the treated tumor was unlikely.On (b)(6) 2020, it was planned to transfer the patient to the national cerebral and cardiovascular center.Because dr.(b)(6) of the initial hospital could not perform the filter retrieval procedure due to missing the surgical backup section.Patient's condition after the operation: the patient is treated with observation.
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