There was an almost complete absence of small lymphocytes in the lymph nodes, spleen, and intestines, but plasma cells were present in these tissues. [jamanetwork.com]

Immunologic features are remarkable: absent thymus, T-cell deficiency, impaired antibody synthesis, cellular immune defect, decreased lymphoid tissue while plasma cells are present, impaired delayed hypersensitivity with poor skin graft rejection. [accessanesthesiology.mhmedical.com]