Fig. 1. Examples of idiopathic orbital inflammation (orbital pseudotumor). Biopsy specimen from a patient with Tolosa-Hunt syndrome with normal orbital tissue, minimal fibrosis, and a sparse, diffuse infiltrate of lymphoid cells (A) (hematoxylin and eosin, × 10); higher power showing mature plasma cells and small lymphocytes (B) (hematoxylin and eosin, × 60). Chronic dacryoadenitis under low power showing an atrophic and inflamed lobule of the lacrimal gland (C) (hematoxylin and eosin, × 2); a lobule with interstitial fibrosis around viable acinar structures with a diffuse lymphoid infiltrate and no lymphoepithelial lesions (D) (hematoxylin and eosin, × 10); and lymphoid infiltrate consisting of small to medium-sized lymphocytes and mature plasma cells (E) (hematoxylin and eosin, × 60).