Lanthanum Gastropathy in Gastrectomy Specimen: A Case Report.

Lanthanum carbonate (LC) is a phosphate binder used in end-stage renal disease (ESRD) with few adverse effects due to poor systemic absorption. Gastrointestinal deposition is likely due to alterations in epithelial permeability from inflammation in ESRD. It is challenging to detect in cases with minimal deposition and may be missed on endoscopy and biopsy.

Clinical presentation and outcomes of Helicobacter heilmannii gastritis in children in the New England region of the United States.

Objective: To describe the clinical, endoscopic, histologic, and treatment outcomes of Helicobacter heilmannii (H. heilmannii) associated gastritis in children in the New England region of the United States.

Methods: Retrospective study of children (1-18 years) with H.

Lifting agent granuloma presenting as a colonic mass mimicking cancer: a report of three cases.

Background: The Food and Drug Administration (FDA)-approved submucosal injection of lifting agents such as ORISE has become a widespread, routine and standard practice in endoscopic mucosal resection and endoscopic submucosal dissection of gastrointestinal lesions. Lifting agent granulomas result from transformation of injected material into a mass-forming amorphous hyaline-like material eliciting a strong foreign body giant cell reaction. This report of three cases shows how lifting agent granulomas can act as potential clinical and gross mimickers of invasive adenocarcinoma.

Lichenoid esophagitis: clinicopathologic overlap with established esophageal lichen planus.

Lichen planus (LP) affects mucocutaneous surfaces and is characterized by intraepithelial and lamina propria lymphocytosis and squamous cell apoptosis (Civatte bodies). Lichen planus esophagitis (LPE) is underrecognized; concurrent cutaneous disease is present in some patients, but LPE alone is more common. We diagnose patients with characteristic pathologic findings of LPE and known correlation with skin disease or immunofluorescence (IF) results as LPE but use descriptive terminology ("lichenoid esophagitis pattern" [LEP]) when confirmation is unavailable.

Composite intestinal adenoma-microcarcinoid clues to diagnosing an under-recognised mimic of invasive adenocarcinoma.

Aims: Microcarcinoids refer to microscopic nests of monotonous cells with endocrine and squamoid features. Their peculiar morphology can appear infiltrative with a desmoplastic-like background, raising concerns for an infiltrating adenocarcinoma. To further characterise microcarcinoids, we undertook a prospective clinicopathological study.

Poorly differentiated colorectal carcinoma with invasion restricted to lamina propria (intramucosal carcinoma): a follow-up study of 15 cases.

Invasive colorectal carcinomas (CRCs) with invasion confined to the lamina propria (LP) [intramucosal carcinoma (IMC)] lack access to lymphatics and therefore have no potential for metastases and local intervention (usually polypectomy) should be adequate treatment. For this reason, they are classified as "Tis" in the TNM system. It is believed that carcinomas invading the submucosa with unfavorable histology (tumors at/near the margin, and/or vascular invasion, and/or poor differentiation) require additional intervention after polypectomy, whereas those with favorable histology can be safely treated endoscopically.

Mucosal benign epithelioid nerve sheath tumors.

Mucosal nerve sheath tumors have been well described in the gastrointestinal tract and other mucosal sites. In a series of mucosal biopsies, we have encountered a distinct subset of mucosal peripheral nerve sheath tumors characterized by small epithelioid cells and a benign clinical course. Such epithelioid nerve sheath tumors have been observed as a component of a larger study of colorectal "schwannomas," but herein we describe them in detail.