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Updated: Oct 24, 2026

Local Anesthetic Thoracoscopy for Undiagnosed Pleural Effusion
Published on: November 10, 2023
Chylothorax vs. Pseudochylothorax: Cholesterol Crystal Finding in Pleural Effusion
Elena Pizarro Peña1, Manuel Ruiz Artero1, Amanda Jiménez García1
1Clinical Analysis Department Hospital Valle de los Pedroches Pozoblanco Córdoba Spain.
Abstract:
Chylothorax and pseudochylothorax are both rare forms of pleural effusion characterized by a milky appearance of the pleural fluid. Despite their similarities, they have distinct etiologies, clinical implications, and medical management strategies. Pleural fluid analysis of cholesterol and triglyceride levels is crucial to differentiate between them, establish a proper diagnosis, and guide clinical evaluation and treatment. This case report describes an uncommon presentation of pseudochylothorax associated with long-standing rheumatoid arthritis (RA) in a patient with no prior history of pleural disease.
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