Florid infectious mononucleosis: clinicopathological correlation in acute tonsillectomy.

In patients with infectious mononucleosis (IM), acute tonsillectomy is advocated only in the minority who develop severe airway compromise. In such florid cases, the pathological diagnosis of IM, well known to morphologically simulate that of lymphoma, is particularly challenging. The present case describes a 15-year old male with a clinical course consistent with IM in whom acute tonsillectomy was performed due to progressive airway obstruction. The striking histological findings emphasize the need for close clinicopathological correlation. Recently available ancillary studies are described which both surgeon and pathologist should be familiar with in the differentiation of IM from other lymphoproliferative conditions.