Dh. Kim et al., MUCOSA-ASSOCIATED LYMPHOID-TISSUE (MALT) LYMPHOMA OF THE THYMUS - CASE-REPORT AND LITERATURE-REVIEW, International journal of surgical pathology, 6(4), 1998, pp. 229-233
We present a rare case of primary low-grade B-cell lymphoma of the thy
mus. The tumor showed the typical features of a MALT (mucosa-associate
d lymphoid tissue) lymphoma with epithelium-lined thymic cyst. Histolo
gically, there were sheets of centrocyte-like (CCL) cells intermingled
with small lymphocytes and plasma cells. CCL cells invaded the epithe
lium of the cyst and residual Hassall's corpuscles, forming characteri
stic lymphoepithelial lesions. Immunohistochemically, the tumor cells
revealed positive immunoreaction for CD20 and monotypic cytoplasmic re
striction of kappa light chain.