CytologicallyYoursCoW20131216Cytology1.jpg|4x 10x magnification of a 4R lymph nodepleural fluid(ThinPrep). Groups of cohesive epithelial appearing cells can be are seen on low power. Lymphoid tissue is not easily identified.CytologicallyYoursCoW20131216Cytology2.jpg|20x 40x magnification of a 4R lymph nodepleural fluid (ThinPrep). This is a cellular specimen with groups Cluster of atypical cells along what appear to be a papillary or papillary-like structure. Single cells are also dispersed in the background. The cells are haphazardly arrangedshowing nuclear pleomorphism and scant cytoplasm.CytologicallyYoursCoW20131216Cytology3.jpg|40x magnification of a 4R lymph nodepleural fluid (ThinPrep). On higher power, the nuclei appear mildly atypical Chromatin is irregular and the cytoplasm is delicate clumped with salt and finely vacuolated. The nuclear contours are somewhat irregularpepper appearance.CytologicallyYoursCoW20131216Cytology4.jpg|Cell block 40x magnification of 4R lymph nodepleural fluid (ThinPrep). The cytoplasm does not appear as vacuolated on alcohol fixed cell block material, but the nuclei are relatively uniform, but somewhat atypicalSome nuclear molding can be appreciated. CytologicallyYoursCoW20131216Cytology5.jpg|Cell block of 4R lymph nodepleural fluid. The Group of malignant cells showing nuclear molding, scant cytoplasm does not appear as vacuolated on alcohol fixed cell block material, but the nuclei are relatively uniform, but somewhat atypicaland salt and pepper chromatin.