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Synchronous Pulmonary Malignancy Detected During PSMA Ligand PET/CT for Initial Staging of Prostate Cancer: a Case Report

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Abstract

We present a case of an 83-year-old man with underlying colorectal cancer who underwent a gallium-68 prostate specific membrane antigen-11 positron emission tomography/computed tomography (68 Ga-PSMA-11 PET/CT) for the initial staging of prostate cancer. PET / CT revealed two mildly PSMA-avid lung nodules without evidence of PSMA-avid nodal or bony metastasis. Subsequently, a wedge pulmonary resection was performed and the histopathology and immunohistochemistry of the nodules were consistent with synchronous primary lung cancer. Because differentiating synchronous primary lung cancer from pulmonary metastasis of prostate cancer can significantly affect treatment strategies and pulmonary metastasis rarely presents during initial staging of prostate cancer, synchronous primary lung cancer should be included in the differential diagnosis of pulmonary lesions in initial staging of 68 Ga-PSMA-11 PET/CT regardless of PSMA avidity. The lack of nodal or bony metastases also decreases the likelihood of lung metastasis, and a tissue diagnosis may be required.

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The data is available upon reasonable request to the corresponding author.

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Acknowledgements

The authors would like to acknowledge all the staffs of the Nuclear Medicine Unit, King Chulalongkorn Memorial Hospital.

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Contributions

Napisa Bunnag participated in the study conception, study design, and manuscript revision. Chirarot Wongwichitsuk participated in data acquisition, data analysis, and manuscript revision. Sira Vachatimanont participated in drafting of the manuscript and approval of the final content. All authors read and approved the final manuscript.

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Correspondence to Sira Vachatimanont.

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Conflict of Interest

Napisa Bunnag, Chirarot Wongwichitsuk, and Sira Vachatimanont declare no competing interests.

Ethical Approval

The present study was approved by the Institutional Review Board of the Faculty of Medicine, Chulalongkorn University (IRB number 0051/66), and with the 2013 Helsinki declaration and its later amendments or comparable ethical standards.

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The informed consent requirement was waived by the Institutional Review Board of the Faculty of Medicine, Chulalongkorn University.

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The institutional review board at our institution approved this retrospective study, and the requirement to obtain informed consent was waived.

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Bunnag, N., Wongwijitsook, J. & Vachatimanont, S. Synchronous Pulmonary Malignancy Detected During PSMA Ligand PET/CT for Initial Staging of Prostate Cancer: a Case Report. Nucl Med Mol Imaging 57, 287–290 (2023). https://doi.org/10.1007/s13139-023-00798-2

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  • DOI: https://doi.org/10.1007/s13139-023-00798-2

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