High-grade B-cell Non-Hodgkin's Lymphoma Masquerading as Thyroid Carcinoma; a Case Report.

Introduction: High grade B-cell lymphoma and diffuse large B cell exhibiting myelocytoma (MYC) translocation with B-cell lymphoma 2 (BCL2) and/or B-cell lymphoma 6 (BCL6) re-arrangements, also known as double and triple hit lymphomas, are aggressive entities. World Health Organization update 2017 includes this cytogenetically defined category of "High grade B cell lymphoma with myelocytoma MYC and BCL2 and/ or BCL6 rearrangements" as a distinct entity on their own. We present an interesting case of an obese patient presenting with a neck mass, suspected to be an aggressive thyroid carcinoma, which eventually turned out to be a high grade B-cell lymphoma.