Sometimes carcinomas appear as loose cells in effusion and can be mistaken for reactive mesothelium. Caution!! 🆘🧠🧐 This case shows a lung adenocarcinoma in pleural fluid. TTF1 (performed on Smears) confirms that most of the cells are tumor cells #cytopathology@IACytology
Parotid Mass - dispersed cells with macronucleoli, cytoplasmic pigment and an intranuclear inclusion. "Metastatic Melanoma" until proven otherwise. IHCs will be optional and often not needed in the presence of a known history. (FNA)