title: Gastric marginal zone lymphoma of mucosa-associated lymphoid tissue and signet ring cell carcinoma, synchronous collision tumour of the stomach: a case report.
abstract: OBJECTIVE
  To report a rare case of synchronous marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT) signet ring cell carcinoma occurring as a collision tumour in the stomach.
  
  
  METHODS
  A 53-year-old man was diagnosed initially with signet ring cell carcinoma of the stomach. The microscopy of the subsequent total gastrectomy revealed a collision tumour of MALT lymphoma and signet ring cell carcinoma associated with Helicobacter pylori gastritis.
  
  
  CONCLUSIONS
  This case highlighted the importance of a careful evaluation of the accompanying lymphoid population in the biopsy samples of gastric adenocarcinoma and underlined the need for multiple endoscopic biopsies to detect these rare synchronous tumours.
authors.affiliation: Department of Histopathology, Mubarak Al-Kabir Hospital, Jabriya, Kuwait.
authors.forename: Smiley Annie
authors.initials: SA
authors.lastname: George
authors.forename: T A
authors.initials: TA
authors.lastname: Junaid
mesh_terms: D018279:Carcinoma, Signet Ring Cell / Q000175:diagnosis* / Q000453:epidemiology; D016481:Helicobacter Infections / Q000175:diagnosis* / Q000453:epidemiology; D016480:Helicobacter pylori; D006801:Humans; D018442:Lymphoma, B-Cell, Marginal Zone / Q000175:diagnosis* / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis* / Q000453:epidemiology; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000453:epidemiology