Carcinold In The Periphery Lung---An analysis of 8 cases

cases of carcinoid in the peripbny lung were reported. Clinically,carcinoid was usually misdiagnosed as tumor-like lesions. The correct diagnosis was dependent upon histopathology after surgery. Histopathologically, the tumor cells were distributed as nest-like,separated by connective tissues where had plentiful blood vessels. Ag granules could be seen in the cytoplasm by Ag stain.Some clear cells showed mucus positive by AB/PAS stain. In immunohistochemistry, S100 ex pressed positive but keratin, vimentin,and CEA negative. Neuro-secretive granules could be found by scan electronic microscope. In prognosis, 6 cases did not recur in 1 to 5 years. One patient survived over 10 years, another patient recured two times in 5 years. We suggested that carcinoid in the periphery lung is a low-grade malignant .tumor, and a favourable prognosis can be obtained if early operations could be undertook.