cosa with partial ulcération infiltrated with acute and chronic inflammatory cells. The final diagnosis was papillary adenocarcinoma of the cystic duct, chronic cholecystitis, cholelithiasis, and hydrops of the gallbladder. The patient's convalescence was un¬ eventful. The prognosis could be good, although operation was performed only five months ago. Comment:-Unusual features of this primary tumor of the cystic 2. Top, Operative view of hydropic gallbladder in situ. Bottom, Surgical specimen opened to show small papillary carcinoma of the cystic duct (arrow). bile duct are the local character of its growth with incomplete and in¬ termittent obstruction known to be present over a period of two years, the local character of the tumor with invasion of the muscle wall but without métastases, the rela¬ tively well-differentiated nature of the tumor and its slow, progressive 3. Top, Columnar epithelial tumor cells, fine areolar supporting tissues and mononuclear cell infiltration (X40). Bottom, Tumor cells are columnar or irregular in shape with finely granular cytoplasm, prominent nuclear mem¬ branes, and large nuclei with coarse, irregular¬ ly distributed chromatin and large nucleoli.growth, and the anticipated good prognosis for this type of cancer of the extrinsic biliary passages.