RESUMO
Hepatic carcinoma expressing inhibin is a recently described neoplasm with varied architecture, including trabecular, pseudoglandular, follicular/microcystic, organoid, solid and tubular patterns of growth. We report a case of hepatic carcinoma expressing inhibin that occurred in a 47-year-old woman presenting with epigastric and back pain. The tumor was located in the left hepatic lobe and measured 12 cm in diameter. On immunohistochemical stains, the neoplastic cells were positive for inhibin, as well as cytokeratins 7, 8/18 and 19. There was mild focal expression of synaptophysin, and lack of expression of hepatocytic markers. The histogenesis of hepatic carcinoma expressing inhibin is presently uncertain. From a practical point of view, this neoplasm can potentially cause diagnostic pitfalls by simulating other primary or metastatic tumors, such as hepatocellular carcinoma, cholangiocarcinoma, neuroendocrine tumors, and follicular carcinoma of thyroid gland. Performing inhibin immunostain could assist in the differential diagnosis of liver tumors with unusual histologic features.
RESUMO
Thoracic duct cysts of the mediastinum are extremely rare entities and their pathogenesis still remains unknown. Imaging methods are not specific and show a cystic mass, however the real nature of the lesion is confirmed only with the help of histopathological examination after surgical excision. Here, we present a case of thoracic cyst in a 28-year-old female, lining in posterior lower mediastinum. The cyst was removed by video-assisted thoracic surgery (VATS) and the histopathological findings were that of thoracic duct cyst. Through this case, we propose an ideal surgical approach and diagnostic procedure.