Related Experiment Video For cancer of unknown primary
Updated: Apr 24, 2026

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
Published on: March 3, 2023
Subtle radiographic presentation of a pleural effusion secondary to a cancer of unknown primary: a case study
Marc-André Blanchette1, Julie-Marthe Grenier2
1Public Health PhD Program School of Public Health, University of Montreal, Montreal, QC.
Abstract:
Carcinoma of unknown primary sites is a clinical syndrome that represents many types of cancer. The mortality rate associate to this type of cancer is elevated and a rapid medical referral is required for patients presenting this condition. Pleural effusion may be the only visible sign. We report a case of pleural effusion secondary to a cancer of unknown primary site in a 60-year-old man that sought chiropractic care for radiating low back pain. The radiographic studies revealed a pleural effusion as one of the only significant finding. This article will address the clinical presentation, radiographic studies and a discussion on the radiographic detection of pleural effusion.
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