Plasmacytoid Carcinoma in Gastrointestinal Tract, Rare Case Presentation.

Plasmacytoid carcinoma is a proliferation of discohesive cells. Gastrointestinal tract plasmacytoid carcinomas, whether primary or metastatic in origin, are both very rare. Immunohistochemistry plays a crucial role in localization.

Primary Gastric and Duodenal Mucosa-Associated Lymphoid Tissue Lymphoma With Symptomatic Anemia.

Mucosal-associated lymphoid tissue (MALT) is a low-grade lymphoma derived from marginal zone B cells in extranodal tissue. Gastric MALT lymphoma is frequently seen; however, duodenal MALT lymphoma is rare, and there is no standardized knowledge up to date about the management of the disease. We present a case of a 56-year-old woman with gastric and duodenal MALT lymphoma.