Resection of pancreatic cystic neoplasms in recurrent acute pancreatitis prevents recurrent pancreatitis but does not identify more malignancies.

Background: Recurrent acute pancreatitis (RAP) may be a presenting feature of and an indication for resection of pancreatic cysts, including intra-ductal papillary mucinous neoplasm (IPMN). Few data are available regarding the prevalence of malignancy and post-operative RAP in this population.

Aim: To study the role of resection to help prevent RAP and analyze if presentation as RAP would be a predictor for malignancy.

Histologic features of autoimmune hepatitis: a critical appraisal.

We speculate that the "typical" histologic features (lymphoplasmacytic interface hepatitis, emperipolesis, and hepatocyte rosettes) of autoimmune hepatitis (AIH) are related to severity of hepatitis rather than etiology. We critically appraised various histologic features of AIH and compared them with cases of chronic hepatitis with similar inflammatory grade and fibrosis stage. Fifty-one patients with clinically confirmed AIH were identified at our institution, of which 43 biopsies (from 42 patients) were taken before initiation of therapy and formed the study group.

Clear cell hepatocellular carcinoma diagnosed by bile duct brushing cytology.

Clear cell hepatocellular carcinoma (CCHCC) is an uncommon morphologic variant of HCC and rarely invades into the main bile ducts. Here we describe a case of CCHCC that was diagnosed by bile duct brushing cytology. Liquid-based preparation of brushing specimen showed clusters of atypical epithelial cells with abundant clear cytoplasm, round nuclei, and occasional intranuclear inclusions.

Colitis Following Initiation of Sofosbuvir and Simeprevir for Genotype 1 Hepatitis C.

Sofosbuvir and simeprevir are used for the treatment of chronic hepatitis C (HCV) genotype 1. Both drugs have been well-tolerated, with diarrhea noted in 6% cases with sofosbuvir, 16% with sofosbuvir plus simeprevir, and 0% with simeprevir. No prior reports exist of colitis secondary to either drug or their combination.

Squamoid cyst of pancreatic ducts: a case series describing novel immunohistochemistry, cytology, and quantitative cyst fluid chemistry.

Squamoid cyst of pancreatic ducts (SCPD) is a benign pancreatic cyst often misdiagnosed preoperatively as a mucinous cyst. The histopathologic features are well described but the cytology and quantitative fluid chemistry profiles from fine-needle aspiration have not been reported. This case series discusses the cytology and cyst fluid chemistry profiles in 2 SCPDs and describes morphologic and immunohistochemical features that have not been previously reported.

Appropriate use of special stains for identifying Helicobacter pylori: Recommendations from the Rodger C. Haggitt Gastrointestinal Pathology Society.

Helicobacter pylori is a major cause of gastroduodenal injury, gastric cancer, and lymphoma, and, thus, there is great interest in its detection and eradication. Several detection methods are available, including histochemical and immunohistochemical stains. Application of these stains in clinical practice is heterogenous, to say the least.

Regulated traffic of anion transporters in mammalian Brunner's glands: a role for water and fluid transport.

The Brunner's glands of the proximal duodenum exert barrier functions through secretion of glycoproteins and antimicrobial peptides. However, ion transporter localization, function, and regulation in the glands are less clear. Mapping the subcellular distribution of transporters is an important step toward elucidating trafficking mechanisms of fluid transport in the gland.

Hepatocellular carcinoma: histologic considerations: pure, mixed, and motley.

Hepatocellular carcinoma (HCC) is the most common primary malignant liver tumor seen in adults. The histopathologic diagnosis of classic or conventional differentiated HCC is seldom challenging, however, HCC is a particularly heterogeneous tumor. HCC often has a medley of morphologic features that are either challenging to recognize as hepatocellular, or represents components that are of complex histogenesis.

Ipilimumab-induced perforating colitis.

Recently, a monoclonal antibody to cytotoxic T-lymphocyte-associated antigen 4, ipilimumab, was approved for the treatment of metastatic melanoma. One of the most common side effects associated with this therapy is diarrhea and colitis. We report 3 cases of perforating colitis induced by ipilimumab requiring colectomy.

Radiology estimates of viable tumor percentage in hepatocellular carcinoma ablation cavities correlate poorly with pathology assessment.

Context: No study has evaluated radiology/pathology correlation of percentage viable tumor (PVT) estimates in ablated hepatocellular carcinoma (HCC) to examine the reliability of radiologic estimates.

Objective: To determine how well interdisciplinary PVT estimates correlate and identify pathologic factors that influence this correlation.

Design: Pathologists and radiologists established blinded PVT estimates in 22 HCC ablation cavities.

Pathology of the liver in copper overload.

Copper accumulation in the liver is associated with cellular and apoptotic injury. Wilson disease is the most well-characterized disorder of disordered copper metabolism. Other less-common disorders include Indian childhood cirrhosis, endemic Tyrolean infantile cirrhosis, and idiopathic copper toxicosis.

Cancer and Leukemia Group B Pathology Committee guidelines for tissue microarray construction representing multicenter prospective clinical trial tissues.

Practice-changing evidence requires confirmation, preferably in multi-institutional clinical trials. The collection of tissue within such trials has enabled biomarker studies and evaluation of companion diagnostic tests. Tissue microarrays (TMAs) have become a standard approach in many cooperative oncology groups.

Serous cystadenoma in communication with the pancreatic duct: an unusual radiologic and pathologic entity.

Cross-sectional imaging is frequently used in the diagnosis of pancreatic cysts, but there can be overlap in radiographic appearance. We present a case of a patient with presumed intraductal papillary mucinous neoplasm (IPMN) who was ultimately found to have a serous cystadenoma in communication with the pancreatic duct. A literature search for serous cystadenoma communicating with the pancreatic duct was performed and the data was reviewed in the context of this case report.

Differences in germinal centre and non-germinal center phenotype in gastric and intestinal diffuse large B-cell lymphomas.

The gastrointestinal tract is the most common extranodal site of lymphoma, and the most common gastrointestinal lymphoma is diffuse large B-cell type (DLBCL). DLBCL can be separated into germinal centre (GCP) and non-germinal centre phenotypes (non-GCP) using CD10, BCL-6 and MUM1 immunohistochemistry, but primary gastrointestinal DLBCL has not been extensively studied. We investigated 48 cases of primary gastrointestinal DLBCL (33% involving the small intestine, 50% the stomach, 13% the large intestine and 4% the ileocecal junction) and found that most (88%) DLBCL in the intestines were of GCP, while only 58% of gastric DLBCL were of GCP.

Diagnostic importance of 9p21 homozygous deletion in malignant mesotheliomas.

Definitive diagnosis of malignant mesothelioma in small specimens can be extremely difficult based on morphology alone. Homozygous deletion of 9p21, the locus harboring the p16 gene, has been reported as the most common genetic alteration in malignant mesotheliomas. Recent studies demonstrated that this alteration may be useful for differentiating benign from malignant mesothelial proliferations in cytology specimens.