An autopsy case of a giant mesenteric lymphoid tumor in a 57‐year‐old female was examined anatomo‐biologically. A 17x15x6 cm3‐sized pinkish gray‐coloured medullary tumor occupying the mesenterium with no evident capsule, invaded the small intestine and pancrease head. Histologically, it was a lymphoid tissue consisting of hyalinized angio‐follicular architecture having epithelioid cells and tingible body macrophages in the follicles. Some small‐sized follicles showed typical Hassalloid architecture and other follicles consisted of monotonous growth of lymphocytes without a mantle zone, some of them fusing with each other. The histopathological appearance of the tumor was that of Castleman's lymphoma and of hyaline‐vascular type of Keller's Classification.13 There was another 0.6x0.5x0.5 cm3‐sized tumor having an angiofollicular architecture in the subserosa of the sigmoid colon. The present case was complicated with vertebral caries, hypogammaglobulinemia (1.2), eosinophilia (50) and panbronchobronchiolitis, the last one being responsi
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