A 77-year-old man with smoking history visited Thoracic Surgery department with a complaint of dry cough and dyspnea for months. Chest CT showed a mass over left upper lobe, mediastinal lymph node enlargement and bilateral lung nodules. CT-guide biopsy of the left upper lung mass revealed transitional cell carcinoma. Nevertheless, no primary origin was discovered after a thorough evaluation of genitourinary tract, including abdominal CT, FDG-PET, cystoscopy and retrograde pyelography. We will discuss the possible reasons for the unknown primary origin of transitional cell carcinoma in a lung mass.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.