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In this video, we use Dr. Schaberg’s (#Kurt’sNotes) to discuss non lymphoma entities arising in the lymph node based on where proliferation includes including follicular regions: A. Reactive follicular hyperplasia v. follicular #lymphoma where you can look at follicular architecture, polarization of germinal center, and #BCL2 +/- in germinal centers to differentiate. A. Then there is #toxoplasma #lymphadenitis where you can see #reactive follicles, epithelioid histiocytes and monocytoid B cells A. #HIV #lymphadenopathy where you can see florid follicular hyperplasia in the early phase and atrophic follicles in the late stage A. #castleman’s disease where you have hyaline vascular type (onion skinning, lollipop vessels) and plasma cell variant (ass with HHV8, HIV, and #poems) A. Progressive Transformation of Germinal Centers. Benign but very rarely associated with NLPHL Paracortical Pattern (space between follicles) B. EBV Lymphadenitis where CD8 is abundant andEBV Positive B. Dermatopathic lymphadenitis (nodes that drain from scratched skin sites) Sinus Expansion C. #Langerhans Cell Histiocytosis where there are eosinophils and + S100, CD1a, LAngerin. C. #rosai-dorfman disease. S100 is also + but CD1a negative C. Malignant entities including #ALCL, #melanoma and #carcinoma. Necrosis D. #kikuchi lymphadenitis - seen in head/neck young asian women with necrosis with absent neutrophils D. Cat Scratch Disease caused by #bartonella henselae. Look for the stellate abscess with suppurative granulomas. D. Granulomas (ddx include #TB, #fungus and #sarcoid) Benign Inclusion/Changes E. #endosalpingiosis - PAX8, CK7, WT-1 +. Look for cilia and peg cells without atypia. E. Salivary gland, thyroid, breast tissue. Should be capsular/subcapsular and have bland cytology. Always rule out #metastasis E. Capsular Nevi - Bland Melanocytes within capsule without atypia. S100 and Melan A + but HMB45 negative E. Lipomatosis - fatty infiltration of lymph node E. Vascular Transformation of Sinuses- Sinuses anastomosing to become small vessels E. #lymphangioleiomyomatosis with spindle cells that have melanocytic markers (HMB45+) and smooth muscle markers (SMA and Desmin + E. Angiomyomatous hamartoma - extensive replacement of lymph node with sclerotic fibrous tissue, usualy in inguinal lymph node E. Foreign material including metal, tattoo, silicone