An example of crystal storing histiocytosis; the patient needs to be evaluated for a plasma cell disorder or other lambda-restricted B cell neoplasm. Arnold CA, Frankel WL, Guo L, Krishnan C, Pfeil S, Schumacher M, Voltaggio L, Yearsley MM, Chen W. Crystal-storing Histiocytosis in the Stomach: A Clue to Subtle Hematolymphoid Malignancies. Am J Surg Pathol. 2018 Oct;42(10):1317-1324. PMID: 29878935. Case by Dr. Elizabeth Montgomery, Clinical Professor, Vice Chair of Faculty De

This lesion arose in the small intestine, resulting in obstruction and probably was related to use of non-steroidal anti-inflammatory drugs. Cortina G, Wren S, Armstrong B, Lewin K, Fajardo L. Clinical and pathologic overlap in nonsteroidal anti-inflammatory drug-related small bowel diaphragm disease and the neuromuscular and vascular hamartoma of the small bowel. Am J Surg Pathol. 1999 Nov;23(11):1414-7. www.innovativsciencepress.com Case by Dr. Elizabeth Montgomery, Clinica

A needle biopsy of this pancreatic solid pseudopapillary neoplasm was labeled "gastric mass". We initially tried to make it into a neuroendocrine tumor.... Sometimes the needle is not where it is believed to be. LEF1 is a nice clean nuclear stain and easier to interpret than beta catenin. Case by Dr. Elizabeth Montgomery, Clinical Professor, Vice Chair of Faculty Development & Mentoring, Director of Surgical Pathology Fellowship Training Program, Co-Director, Pathology Refere