Thymus - Involution - Gallery

Thymus - Involution in a female Harlan Sprague-Dawley rat from a chronic study. The lymphocyte density is significantly decreased (arrow), and the corticomedullary junction is indistinct. Adipocytes infiltrate the capsule.

Thymus - Involution in a female Harlan Sprague-Dawley rat from a chronic study (higher magnification of Figure 1). Small aggregates of plasma cells (arrows) are present within the medulla, and medullary epithelial cells are prominent.