Pathology Activated T cells infiltrate orbital contents and stimulate fibroblasts,leading to: 1.Enlargement of extraocular muscles 2.Cellular infiltration of interstitial tissues 3.Proliferation of orbital fat and connective tissue Pathology Activated T cells infiltrate orbital contents and stimulate fibroblasts, leading to: 1.Enlargement of extraocular muscles 2.Cellular infiltration of interstitial tissues 3.Proliferation of orbital fat and connective tissue