Focal autoimmune pancreatitis and chronic sclerosing sialadenitis mimicking pancreatic cancer and neck metastasis

Figure 1 Rare computed tomography images of type I autoimmune pancreatitis. A same image with pancreatic cancer (PC) in the body of the pancreas (white arrow) one year ago prior to admission (A), a similar image of pancreatic head carcinoma (white arrow) accompanied by common bile duct dilation (black arrow) at admission (B), and slightly reduced in the pancreatic head volume (white arrow) with a normal common bile duct (black arrow) after steroid therapy (C).

Figure 2 Histological findings of the excisional biopsy specimen of the lower lip lumps. Hematoxylin and eosin (HE) stain showing normal labial gland (A, × 400); acinar atrophy and lymphoplasmacyte infiltration and fibrosis from the patient (B, × 400); immunohistochemical staining for IgG4 (red color) (C, × 400) or IgG (yellow color) (D, × 400) in plasma cells from the patient.

Figure 3 Histological findings of the resected specimen from pancreatic body mass. Hematoxylin and eosin (HE) stain showing phlebitis (A, × 200); numerous lymphoplasmacyte infiltration and storiform fibrosis (B, × 200); immunohistochemical staining showing IgG4-positive plasma cells (C, × 400) and IgG-postive plasma cells (D, × 400) in the resected pancreatic sections of the patient.