Probably synonymous with "Peyer's patches" (though I found some sources that used the term to refer to clumped or organized lymphoid tissue). Even if the terms were synonyms, accoding to general theory of terminology the name that is descriptive (intestinal lymphoid tissue) takes precedence over the one that contains a proper name (Peyer's patches).

All dogs demonstrated severe and multifocal hypertrophy of **Peyer's patches and intestinal lymphoid tissue** (Fig. 1). Moderate splenomegaly was observed in ...
www.blackwell-synergy.com/doi/abs/10.1196/annals.1307.010

Studies of **intestinal lymphoid tissue**. III. Quantitative analyses of epithelial lymphocytes in the small intestine of human control subjects and of patients ...
www.pubmedcentral.nih.gov/articlerender.fcgi?artid=497709

"lymphoid tissue (Peyer's patches and solitary lymphoid follicles**) as well as ... that**intestinal lymphoid tissue is a. crucial target** organ in the initial ...
www.curedisease.com/Pathways/summer_05.pdf