Pulmonary Mucinous Cystadenocarcinoma: Report a Case and Review of CT Findings
A 54-year-old asymptomatic woman was found to have a mass in the right middle lung zone on a routine chest radiograph. The results of the clinical examinations and routine laboratory tests were unremarkable. A chest CT showed a lobulated hypodense mass (4.3 cm maximum diameter) with peripheral stippled calcifications. The mass had well-defined margins, with no enhancement following contrast administration (5.7 Hounsfield unit) and had no hilar or mediastinal lymph node enlargement (). 18F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography revealed mild heterogeneous FDG uptake (SUV = 2.6) (). Initially, the lesion was diagnosed as adenocarcinoma with mucin production or mucinous adenocarcinoma by transbronchial lung biopsy. A right middle lobectomy was performed, and the specimen contained a lobulated, cystic, and gelatinous mass measuring 4.5 × 3.5 × 2.5 cm (). Histopathologically, the tumor consisted of abundant mucin-filling cysts surrounded by thick fibrous walls. Columnar mucinous epithelial cells lined the thickened alveolar walls. Over the 9-month follow-up period, the patient remained free of recurrent disease.