Nodular Lymphocyte Predominant Hodgkin Lymphoma of the Ileum.

Nodular lymphocyte predominant Hodgkin lymphoma (NLPHL) is a rare lymphoma derived from germinal center B lymphocytes that typically presents with localized lymph node involvement and can mimic a variety of both reactive and other neoplastic conditions. Extranodal involvement is uncommon in NLPHL and typically occurs in the context of previously documented or synchronous nodal disease. Involvement of the gastrointestinal tract is exceedingly rare. Here, we present the first case to our knowledge of NLPHL involving the ileum that was discovered incidentally on routine screening colonoscopy in an asymptomatic patient. An awareness of the spectrum of clinical presentations, careful morphologic evaluation, and a comprehensive panel of immunohistochemical stains are essential for correct diagnosis of NLPHL presenting in unusual anatomic sites.