Oral Hodgkin lymphoma: a wolf in wolf's clothing.

Hodgkin lymphoma typically presents as a nodal lesion and infrequently involves extranodal sites. The English language literature contains only 7 reports of primary Hodgkin lymphoma arising in the oral mucosa in the absence of nodal disease. We report a case of primary, extranodal Hodgkin lymphoma in the palatal mucosa of a 79-year-old white female. An incisional biopsy revealed a diffuse, mixed cellular infiltrate, consisting of benign lymphocytes, plasma cells, histiocytes, and foci rich in eosinophils. Within this background was a scattering of large, atypical cells, including Reed-Sternberg forms that exhibited immunoreactivity for CD30 and CD20 and nonreactivity for CD15 and CD45RO, supporting a diagnosis of classical Hodgkin lymphoma. Positron emission tomography exhibited a single focal area of abnormal hypermetabolic activity involving the left palate area, without involvement of any other site. The clinical stage was Ann Arbor I-A. The primary tumor and submandibular and upper neck lymph nodes were treated with a 6-MV photon beam to a total dose of 4000 cGy. There was no evidence of disease at 15-month follow-up.