Pseudomesotheliomatous adenocarcinoma of the lung with synchronous gastric and esophageal cancer.

Pseudomesotheliomatous adenocarcinoma is an uncommon variant of peripheral lung cancer. This condition mimics a malignant mesothelioma in terms of its clinical presentation and its gross and microscopic appearance. An immunohistochemical investigation is important when it is difficult to determine whether diffuse carcinomatous involvement of the pleura is secondary to metastasis, lung cancer, or mesothelioma. We herein report a very rare case of concomitant pseudomesotheliomatous adenocarcinoma, gastric cancer and esophageal cancer.