“…Compression of the right ventricle and transudative pleural effusion has also been described ( 6 ). Although CTC usually grows very slowly, yet there are some cases of unilocular thymic cysts that enlarge rapidly by intracystic hemorrhage in children with aplastic anemia ( 7 ). The differential diagnosis of CTC includes, a neoplasm with cystic degeneration, post radiation cystic degeneration of the thymus, a complex cystic lesion, bronchopulmonary foregut duplication cyst, cystic lymphangioma, mesothelial cyst, pancreatic pseudocyst herniating through the diaphragm, thoracic aneurysm, and thoracic duct cyst ( 8 ).…”