[Invasive thymoma involving the liver: a case report of transdiaphragmatic extension]

A 38-year-old woman had an invasive thymoma which disseminated into the thoracic cavity and infiltrated the lateral liver surface. Such transdiaphragmatic extension by an invasive thymoma is rare, however, routine abdominal CT should be performed in invasive thymoma cases to avoid underestimating the extent of disease.