増大傾向を示した右下葉 ciliated muconodular papillary tumor の 1 例―自験例の 10 例の検討―

Background. Bronchiolar adenoma/ciliated muconodular papillary tumor (BA/CMPT) is a benign tumor with a rare histology. However, the development of BA/CMPT on computed tomography (CT) remains unclear. We herein report a case of BA/CMPT showing growth after 1.5 years of CT follow-up. Case. A 67-year-old man presented to our hospital for surgery for a ground-glass opacity nodule in the right lower lobe. He underwent wedge resection after CT-guided marking with indigo carmine and lipiodol mixture. Pathologically, the nodule was diagnosed as BA/CMPT. In addition, we examined 10 cases of BA/CMPT in our institution and summarized the clinical background, CT findings and genetic alterations. Conclusion. We experienced a case of BA/ CMPT growth and examined 10 cases in our institution. BA/CMPT is a rare tumor that grows under CT observation. It is important to diagnose BA/CMPT promptly because of its favorable prognosis and the probability of malignancies with genetic alterations.