Histological finding | NACP | ACP |
Involved ducts | Especially medium sized interlobular ducts | Large interlobular ducts |
Periductal inflammation | Conspicuous dense, infiltrating epithelium | Mild scattered, not infiltrating epithelium |
Lymphocytes | Abundant (T>B) | Sparse (T) |
Neutrophils | Present | Present in association with calculi |
Eosinophils | Present | Absent |
Plasma cells | Present | Present |
Macrophages | Present | Very rare |
Dendritic cells | Present | Very rare |
Calculi | No | Yes |
Pseudocysts | No | Yes |