Case ReviewsMucinous Carcinoma of the Ovary With Signet Ring Cells: Primary Tumor or Metastatic Spread?Singh, Naveena FRCPath; Lam Shang Leen, Sarah FRCPathAuthor Information From the Department of Cellular Pathology, Barts Health NHS Trust, London, UK. Reprints: Naveena Singh, Department of Cellular Pathology, Barts Health NHS Trust, 2nd Floor, 80 Newark St, London E1 2ES, UK. E-mail: firstname.lastname@example.org. The authors have no funding or conflicts to declare. AJSP: Reviews & Reports: 9/10 2016 - Volume 21 - Issue 5 - p 222-226 doi: 10.1097/PCR.0000000000000156 Buy Metrics Abstract We describe a case of mucinous carcinoma of the ovary with signet ring cell morphology presenting in a young woman. No primary tumor was identified radiologically or endoscopically, and the patient is clinically well 2 years after the initial ovarian tumor. The presence of signet ring cells in a primary mucinous carcinoma is unusual, and in the first instance metastasis from a separate primary tumor should be excluded. Features differentiating a primary ovarian carcinoma from a metastatic tumor spreading from a separate primary are considered. Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.