Angiotropic (intravascular) large cell lymphoma of T-cell phenotype presenting as acute appendicitis in a patient with acquired immunodeficiency syndrome

We describe a patient with acquired immunodeficiency syndrome who presented with acute appendicitis but was found to have angiotropic large cell lymph oma (ALCL) by pathologic examination of the appendectomy specimen, without acute inflammation. Very rare cases of angiotropic large cell lymphoma have been reported in patients with human immunodeficiency virus infection, and most cases of this rare lymphoma are of B-cell origin, but in this instanc e immunohistochemical analysis showed a T-cell phenotype.