Localized large B-cell lymphoma with MYC and BCL6 rearrangements as an unexpected finding in an appendectomy specimen.

Large B-cell lymphomas (LBLs) comprise a genetically heterogeneous group of clinically aggressive non-Hodgkin lymphomas, frequently exhibiting overlapping features with diffuse large B-cell lymphoma and Burkitt's lymphoma. We report a case of a 24-year-old, previously healthy male with a classical clinical presentation of acute appendicitis. The pathologic examination discovered a large B-cell lymphoma with MYC and BCL6 rearrangements in the excised appendix. The patient was assigned Stage IEA, IPI = 0 and received chemotherapy. This case depicts a very uncommon occurrence of fully localized LBL in a patient of an unusually young age and clinical presentation for this type of lymphoma.