Lymphocytic infiltrate with predominance of IgG4-positive plasma cells and CD4+ T lymphocytes; |
Storiform fibrosis or fibrosis consisting of proliferating spindle-shaped cells around infiltrating lymphocytes; |
Obstructive phlebitis; |
Refers to a carcass wheel pattern with a sometimes spiral center, and bands of fibrosis emanating from it with an irregular tangled weave somewhat resembling that of a straw mat. |