Castleman Disease, Hyaline Vascular Type: Germinal Center Depletion & BCL2 Positivity in Follicular Cells May Be mistaken for Low grade Follicular Lymphoma in Limited biopsies

Lessons From the Friday Unknowns

Histologic examination shows a markedly enlarged lymph node with variably-sized secondary follicles, some showing regressive changes with highly expanded mantle zones showing onion skinning.