Mediastinal peripheral T-cell lymphoma diagnosed by repeated biopsies after an initial diagnosis of fibrosing mediastinitis.

We report a case of mediastinal peripheral T-cell lymphoma not otherwise specified (PTCL-NOS) diagnosed by repeated biopsies. A 44-year-old man was admitted to our hospital with a 2-week history of facial swelling, neck distension, and dyspnoea on exertion. Computed tomography of the chest showed a mediastinal mass.