Seminal Vesicle - Inflammation

Inflammation of the seminal vesicle can be acute with a neutrophilic infiltrate in the interstitial as well as in the glandular lumen (Figure 1 and Figure 2). In Figure 2 the inflammation has destroyed the glandular architecture. In Figure 3 and Figure 4 it is associated with squamous metaplasia of some affected glands. The inflammatory response may also be associated with hyperplasia (arrow, Figure 2) and epithelial necrosis (arrowhead, Figure 2). Inflammation can be a more chronic, primarily interstitial reaction, with breaking up of the mucosa into small glandular structures (Figure 5 and Figure 6). Seminal vesicle inflammation is a sporadic incidental finding seen in older rats and mice.

NTP studies have five standard categories of inflammation: acute, suppurative, chronic, chronic-active, and granulomatous. In acute inflammation, the predominant infiltrating cell is the neutrophil, though fewer macrophages and lymphocytes may also be present. There may also be evidence of edema or hyperemia. The neutrophil is also the predominant infiltrating cell type in suppurative inflammation, but they are aggregated, and many of them are degenerate (suppurative exudate). Cell debris from both the resident cell populations and infiltrating leukocytes, proteinaceous fluid containing fibrin, fewer macrophages, occasional lymphocytes or plasma cells, and, possibly, an infectious agent may also be present in the exudate. Grossly, these lesions would be characterized by the presence of pus. The tissue surrounding the exudate may have fibroblasts, fibrous connective tissue, and mixed inflammatory cells, depending on the chronicity of the lesion. Lymphocytes predominate in chronic inflammation. Lymphocytes also predominate in chronic-active inflammation, but there are also a significant number of neutrophils. Both lesions may contain macrophages. Granulomatous inflammation is another form of chronic inflammation, but this diagnosis requires the presence of a significant number of aggregated, large, activated macrophages, epithelioid macrophages, or multinucleated giant cells.