Surgical Treatment by Partial Petrosectomy for a Middle-Ear Carcinoid with Progressive Extension: A Case Report and Review of the Literature
Figure 3
Pathological findings. The histopathological findings revealed a solid tubuloglandular pattern, resembling an adenomatous tumor of the middle ear ((a) examination on low power). One cell type, the A-type cells lining the glandular lumina, was observed with a lower frequency. These slender darkly staining cells had the appearance of endothelial cells. The other cells, the B-type cells, were observed in glandular structures and were characterized by a round or oval nucleus and an abundant, pale cytoplasm ((b) examination on high power). The B-type cells were typically positive for cytokeratin, chromogranin A, and synaptophysin, and 6.6% of the carcinoid tumor cells were positive for MIB-1 staining.
