A Rare Case of Malignant Insulinoma Associated With Gastrointestinal Bleed.

A gastrointestinal bleed (GIB) in the setting of metastatic insulinoma is a rare phenomenon. It appears that cases of metastatic insulinoma causing GIB are rare, often influenced by the tumor's location. Our case involves an 82-year-old male with dementia and a history of recurrent hypoglycemia, presenting with an episode of altered mental status.

Rituximab-Induced Colitis and Esophagitis in a Patient With Granulomatosis With Polyangiitis.

Granulomatosis with polyangiitis (GPA) is a small vessel vasculitis that affects many organ systems with varying disease severity. GPA commonly affects the sinuses and lung parenchyma. However, GPA can affect the gastrointestinal tract and may present as colitis.

Gastric Glomus Tumor Presenting With Gastrointestinal Bleed and Pulmonary Embolism: A Rare Entity With Management Dilemma.

Glomus tumors are rare neoplasms originating from smooth muscle cells of the glomus body. They rarely involve the gastrointestinal tract, and when they do, they present as acute gastrointestinal bleeds with symptoms such as hematemesis or melena. We present a rare case of a gastric glomus tumor in a 50- year- old male presenting with shortness of breath and gastrointestinal bleed requiring transfusions.

A Unique Case of Mantle Cell Lymphoma Masquerading as a Cecal Mass.

Mantle cell lymphoma (MCL), a type of B-cell non-Hodgkin's lymphoma, is a rare and aggressive disease with a poor prognosis due to its advanced presentation at diagnosis. It is characterized by a translocation in the Bcl-1 gene, which results in overexpression of cyclin D1. MCL is frequently seen in the form of multiple lymphomatous polyposis (MLP) in which innumerable polyps are observed in the gastrointestinal (GI) tract.