Septal thickening with inflammation at the periphery of the lobules with some spillover of the inflammation into the lobules.

Septal thickening and inflammation at the periphery of the lobules.

A mixed infiltrate comprised of lymphocytes, histiocytes, neutrophils, and occasional multinucleated giant cells and plasma cells.

Mixed infiltrate at the periphery of the lobules comprised of lymphocytes, histiocytes, plasma cells, and occasional neutrophils.