Journal of Pathology and Translational Medicine

Case Report

Primary Extramedullary Plasmacytoma of the Colon: A Case Report.: Ok Ran Shin, Gyeong Shin Park, Youn Soo Lee, Eun Sun Jung, Sun Moo Kim, Byung Kee Kim; Korean J Pathol. 2001;35(1):80-82.

Abstract PDF: Extramedullary plasmacytoma is a relatively rare tumor, occuring in a wide variety of organs and tissues, and is most frequently seen in the oral cavity and upper respiratory tract. Solitary extramedullary plasmacytoma located in the gastrointestinal tract is rare, especially the in colon. We report a case of solitary extramedullary plasmacytoma in the cecum of a 58-year-old man which simulated a carcinoma both endoscopically and radiologically. But histopathologic evaluation demonstrated a sheet-like proliferation of pure plasma cells with monoclonality for IgM and lamda chain which confirmed the diagnosis of plasmacytoma.

Original Articles

The Increased Expression and Diagnostic Usefulness of CD56 Antigen in Paraffin Embedded Plasma Cell Neoplasm.: Seok Hyung Kim, Chan Sik Park, Eun Young Choi, Hyun Wook Kang, Seong Hoe Park, Doo Hyun Chung; Korean J Pathol. 2001;35(3):201-205.

Abstract PDF: BACKGROUND
The natural killer cell antigen CD56 (NCAM) is a member of the immunoglobulin superfamily and is expressed on neurons, astrocytes, and Schwann cells. Recently, it has been reported that CD56 expression is detected on plasma cells of multiple myeloma by flow cytometry.
METHOD
In this study, to test the diagnostic usefulness of the anti-CD56 antibody for plasma cell neoplasm on paraffin-embedded materials, we performed immunohistochemical staining of samples from 19 patients with plasma cell neoplasms. These cases included 14 cases of multiple myeloma, 3 cases of solitary plasmacytoma of the bone, and two cases of extramedullary plasmacytoma.
RESULTS
The neoplastic plasma cells from 68 % of the patients with plasma cell neoplasms expressed CD56 highly. CD56 was expressed in all three cases of solitary plasmacytoma of the bone and one of two extramedullary plasmacytoma, and nine out of 14 multiple myeloma cases. In contrast, reactive plasma cells from the 18 patients with miscellaneous lesions were completely negative for CD56.
CONCLUSIONS
CD56 is aberrantly expressed on the neoplastic plasma cells, and it may be used as a useful marker for the diagnosis of plasma cell neoplasms in paraffin-embedded tissues.

Cytologic Features of Plasmacytoma of the Ovary and Breast Occurred in a Patient with Solitary Plasmacytoma of Vertebra .: Mi OK Park, Hoon Kyu Oh, Yong Jin Kim, Jae Bok Park; Korean J Cytopathol. 1997;8(2):164-169.

Abstract PDF: A case of plasmacytoma of the ovary and breast, which developed in a patient with a solitary plasmacytoma in the lumbar vertebra for nine months, was diagnosed cytologically and histologically. Enlargement of the right ovary and multiple palpable masses in the right and left breast were already present at six months after the diagnosis of vertebral solitary plasmacytoma. At eight months, plasma cell leukemia developed, and nine months the enlarged both ovaries, replaced by yellowish-gray solid tumors showed infiltration of immature plasma cells. The cytologic features of the ovarian tumors were same with those of the breast tumor. The tumor cells were of predominantly immature plasma cells with one or more nuclei. Some mature plasma cell had an eccentric nucleus with single nucleolus and peripherally clumped chromatin. Binucleated or multinucleated giant cells were often present. Histologically, sheets of poorly differentiated plasmacytoid tumor cells were separated by strands of hyaline fibrous tissue. On immunohistochemical stains, the tumor cells showed strong reactivity for lambda-light chain but no reaction for kappa-light chain, cytokeratin, or leukocyte common antigen.

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