Inclusion Criteria:  Pathological mediastinal nodes within reach of EBUS sampling on CT-scan. Lymphoma suspicion by a senior clinical hematologist Affiliated to the french public health care insurance  Exclusion Criteria:  Peripherical pathological lymph nodes reachable without general anesthesia Antithrombotic medication that cannot be stopped le time of the procedure. Unstable respiratory status History of lymphoma Latex or xylocaine allergia