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A 43-year-old asymptomatic woman with no history of smoking was referred to our hospital because of decreased radiolucency in the left lower lung field (figure 1A), which was found by chest X-ray performed as part of a routine investigation during a medical check-up. No abnormal shadow was recognised by chest X-ray performed two years previously (figure 1B). Initial laboratory data included a white blood cell count of 4710/μl (neutrophils, 48.6%) and a C-reactive protein level of 0.03 mg/dL. Chest enhanced CT revealed a solitary lobulated low attenuation mass with septal enhancement, approximately 6 cm in diameter, across the left lateral and posterior basal segments (figure 1C-D). The internal structure appeared multilocular and was filled with fluid. A small part of the margin of the mass was accompanied by stippled calcification (figure 1D-E). Bronchoscopic examination was performed on suspicion of pulmonary mucinous cystadenocarcinoma (PMCAC). However, the forceps could not reach the mass. Bronchial lavage bacterial culture, acid-fast bacillus smear (Ziehl-Neelsen stain) and PCR tests for …
Contributors Conception and design: NK, TS. Collection and interpretation of data: NK, TS, KN, HH, FO. Drafting of the manuscript: NK, TS. Approval of the final version of the manuscript: NK, TS, KN, HH, FO.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement There are no additional unpublished data.
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