Macroscopy: endoscopic ultrasound-guided FNA of pancreatic head mass—needle cores received in formalin.
Microscopy: normal duodenal epithelium and fragments of fibrous connective tissue within which there are variably sized glands infiltrating and lined by moderately pleomorphic epithelium. Features are those of adenocarcinoma.
Conclusion: FNA of the pancreas head is mass-malignant.