Abstract
A case of bronchial carcinoid diagnosed by means of bronchial scraping cytology, was studied cytologically, histologically and electron microscopically.
Cytologic findings were as follows;
1) Tumor cells were seen in single and irregular flattened clusters. A few rossete formations were found.
2) Cytoplasm was lightly stained, and cytoplasmicrim was poorly defined.
3) The nuclei of tumor cells were round 6-10 micron in size, and composed of severely increased chromatin with fine and/or rough granular pattern.
4) Nucleoli was not prominent
Histologically, the tumor was A type by Soga's classification in argyrophil type, but generally the foregutderived carcinoids were predominantly B type.
The fine structure exhibited characteristic granules of the so-called neurosecretory granules; The granules were 120-300 millimicrons in size, round and were composed of electron dense core enclosed by unit membrane. The morphological findings described above, revealed a typical case of bronchial carcinoid.
