Primary gastric lymphoplasmacytoid malignant lymphoma (gastric plasmacytoma): an endoscopic cytologic diagnosis

A case of primary gastric plasmacytoma in which diagnosis was made preoperatively by an endoscopic technique is presented. Exfoliative cytology using a brush under direct visual control enabled the case to be classified as lymphoplasmacytoid malignant lymphoma. Data which favor the diagnosis of plasmacytoma are: 1) plasma cells in various stages of maturation, 2) abnormal plasma cells often in mitotic division, 3) the presence of atypical immunoblasts.