RESUMEN
The selection of anticoagulant therapy and appropriate duration of treatment for central venous (CV) catheter-associated internal jugular vein thrombosis in patients with malignant lymphoma remain unclear. Two cases of aggressive B-cell lymphomas treated with R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisolone), in which apixaban administered for less than three months was effective against CV catheter-associated internal jugular vein thrombosis, are reported. In one case, the right internal jugular vein thrombosis developed after eight courses of R-CHOP; when apixaban was orally administered for 37 days after the CV catheter was removed, the thrombus completely dissolved and did not recur for 27 months. In the other case, right internal jugular vein thrombosis developed after four courses of R-CHOP; two additional courses of the R-CHOP were administered alongside oral apixaban administration without catheter removal. After 66 days of oral apixaban, the thrombus completely dissolved, the CV catheter was removed, and no recurrence was observed for 8.5 months.