Cytologic features of carcinoid tumors and small cell carcinoma: Photo A shows a Papanicoulau stain of a fine needle aspirate of a peripheral carcinoid tumor. Photo B shows a similarly stained smear of a bronchial wash.
A. The carcinoid tumor has spindled cells with smooth nuclear contours. Light blue cytoplasm is present. Mitoses and molding are absent.
B. The small cell carcinoma has hyperchromatic nuclei with irregular shapes. Nuclear size is greater than that of the lymphocyte at the lower left corner. Cytoplasm and nucleoli are absent. Indentation of one nucleus by another (molding) is present at the arrow.
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