title: Pulmonary pseudolymphoma.
abstract: Pseudolymphomas of the lung are extremely rare with approximately 30 cases reported in the literature. Histologically it may be impossible to distinguish a benign pseudolymphoma from a malignant lymphoma. Immunoperoxidase staining has been proposed to help predict the benign or malignant potential of these conditions. Results thus far have been inconclusive, but a monoclonal pattern has tended to predict malignant potential. We have reported a pulmonary pseudolymphoma that failed to stain with the immunoperoxidase technique due to improper tissue fixation. After four years of clinical follow-up, the patient remains disease free.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000175:diagnosis*; D008223:Lymphoma / Q000175:diagnosis*; D008297:Male