Fig. 7

Histopathology of mesenteric lymph nodes (a: HE staining of mesenteric lymph nodes showing infiltration of lymphocytes, macrophages, and epithelioid macrophages in the subcapsular sinus and paracortex; b: HE staining of the mesenteric lymph node cortex showing multifocal granulomatous lesions; c: HE staining of mesenteric lymph nodes showing granulomas primarily composed of epithelioid macrophages and multinucleated giant cells; d: Ziehl–Neelsen acid-fast staining of mesenteric lymph nodes showing AFB (red arrow) within the cytoplasm of medullary and epithelioid macrophages)