Figure 2

Distinctive dark brown pigmentation of pleural fluid during pleuroscopy and persisting post fluid centrifugation. (a) Pleural fluid with a distinctive dark brown pigmentation visible during pleuroscopy of the patient with metastatic papillary thyroid carcinoma. The lung remained trapped post pleuroscopy and drainage. (b) Persistence of brown pigmentation of pleural fluid post centrifugation, suggesting the presence of a dissolved substance later confirmed to be iodine.