Abstract
Background. Mucinous ("colloid") adenocarcinoma of the lung is a rare malignancy. Case. A 71-year-old woman was admitted to our hospital because of an abnormal shadow in the right lung field on a routine health check chest X-ray. Chest CT showed a consolidation 80 mm in diameter in right lower lobe. FDG-PET (fluorodeoxyglucose-positron emission tomography) showed no accumulation in the lesion. Through the follow up, the size of the lesion was not changed. The diagnosis was not defined by percutaneous CT-guided needle biopsy. We performed an operation for definite diagnosis and treatment. Sure core needle biopsy intra-operative frozen section histology showed carcinoma with abundant mucin, a right lower lobectomy with lymph node dissection was performed. The pathologic classification was determined with mucinous ("colloid") adenocarcinoma, T2N0M0, Stage IB. Conclusion. We here report a case of mucinous ("colloid") adenocarcinoma for which diagnosis was difficult.
