Primary gastric plasmacytoma: a rare entity.
Extramedullary plasmacytomas (EP) are tumours composed by a monoclonal population of plasma cells that arise in extraosseus tissues, comprising <5% of all plasma cell neoplasms. Usually, EP arise in the head and neck region, and the stomach is the second most common location-gastric plasmacytoma (GP). Clinical and radiological manifestations are unspecific and may mimic other tumours like gastric adenocarcinomas, gastric stromal tumours and lymphomas, mainly marginal cell lymphoma (MALT lymphoma) and usually definitive diagnosis is provided by pathological evaluation. We present a case of primary GP, discovered incidentally as a polypoid lesion. Tumour was composed by sheets of mature and immature plasmocytes positive for CD138 on immunohistochemistry, without Helicobacter pylori identification. The patient is alive 6 years later and without tumour relapse.
Department of Pathology, Hospitais da Universidade de Coimbra, Coimbra, Portugal.
Rui Caetano
RC
Oliveira
Department of Gastroenterology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.
Pedro
P
Amaro
Department of Pathology, Hospitais da Universidade de Coimbra, Coimbra, Portugal.
Maria José
MJ
Julião
Pathology Department, University Hospital Center of Coimbra, Coimbra, Portugal.
Maria Augusta
MA
Cipriano
D003937:Diagnosis, Differential; D016099:Endoscopy, Gastrointestinal / Q000379:methods; D005753:Gastric Mucosa / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D018442:Lymphoma, B-Cell, Marginal Zone / Q000175:diagnosis / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010954:Plasmacytoma / Q000175:diagnosis* / Q000473:pathology; D013270:Stomach / Q000473:pathology; D013274:Stomach Neoplasms / Q000175:diagnosis*