Abstract
An ultrastructural study was performed on 104 sequential fluids in which more than eight malignant cells per ten high-power fields were found by routine light microscopy. The study included fluids associated with mesotheliomas, melanomas, lymphomas, squamous-cell carcinomas, small-cell anaplastic (oat-cell) carcinomas, and adenocarcinomas. Electron microscopic examination reliably separated lymphoid from epithelial malignancies and benign from reactive and malignant mesothelial cell proliferations. It also suggested or identified a primary site for the adenocarcinomas. Ultrastructural examination of fluids can be a valuable adjunct to routine light microscopy of cytology specimens. No false-positive diagnoses were encountered. Sampling was the most significant limitation for this technique.
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