{
  "abstract": "A man in his mid-70s presented with haematuria and haematospermia and experienced a multiyear diagnostic delay due to initially benign impressions. A diagnosis of Gleason 8 prostate adenocarcinoma was eventually rendered, despite consistently normal prostate-specific antigen levels. A prostate-specific membrane antigen-positron emission tomography scan, negative for prostatic uptake, unexpectedly revealed a lung lesion, subsequently confirmed as metastatic adenocarcinoma. Expert pathology review at a tertiary cancer centre, using comprehensive immunohistochemistry—including paired box gene 8 (PAX8), cancer antigen 125 (CA-125) and hepatocyte nuclear factor 1 beta (HNF1Beta) positivity alongside negative prostatic markers—established a final diagnosis of metastatic clear cell seminal vesicle adenocarcinoma invading the prostate. Despite therapies targeting a checkpoint kinase 2 (CHEK2) mutation (a poly(ADP-ribose) polymerase (PARP inhibitor)), followed by taxanes, platinum-based chemotherapy and radiosurgery for brain metastases, he ultimately succumbed to a stroke linked to his malignancy.",
  "authors": [
    {
      "affiliations": [
        "Department of Medicine, Mercy Hospital St Louis, St. Louis, Missouri, USA"
      ],
      "name": "Mohamed M. Khamis"
    },
    {
      "affiliations": [
        "Department of Medicine, Mercy Hospital St Louis, St. Louis, Missouri, USA"
      ],
      "name": "Morgan Lynelle Walters"
    },
    {
      "affiliations": [
        "Department of Hematology/Oncology, Mercy Hospital St Louis Area, St. Louis, Missouri, USA"
      ],
      "name": "Heide A Rodgers"
    }
  ],
  "title": "Metastatic clear cell seminal vesicle carcinoma masquerading as high-grade prostate cancer",
  "uid": "6ad2fae5-9f94-5186-bf26-486485a1294e"
}