Purpose To illustrate the imaging and clinical features of bronchiolar adenoma(BA),and improve the understanding of BA.Materials and Methods Retrospective analysis of clinical and imaging data of 62 patients with BA who underwent surgical treatment in Shandong Provincial Hospital from January 2019 to November 2023,the imaging characteristics of BA including type,diameter,position,CT manifestations and changes during follow-up.Results Among the 62 patients,63 lesions had confirmed by pathological diagnosis and obtained clear CT images were analyzed.The diameter of the lesions ranged from 3.0 to 37.0 mm,with a median of 9.0(6.0,13.5)mm.61 lesions distributed in the periphery and 2 lesions distributed in the center.43 lesions(68.3%)were located in the lower lobe of the lung.Classified by CT image features,there were 12 cases of solid type,21 cases of gross glass type,23 cases of vacuolar/cystic cavity type,and 7 cases of inflammatory type.23 lesions with vacuolar/cystic cavity signs and 13 lesions with vascular signs.30 patients were followed up before surgery,with a median follow-up time of 195.0(61.5,492.0)days.The lesions of 23 patients had no obvious change;the lesions of 5 patients increased with an average rate of 2.5 mm every year.New vacuolar and pleural indentation signs appeared in the lesions of 2 patients.Conclusion For BA,solid nodules,ground-glass nodules,vacuolar/cystic nodules and inflammatory nodules located in the peripheral bands of the lung can be visualized on CT.Vacuolar/cystic cavity signs and vascular signs are most common within the lesion.During the follow-up,the BA lesions are stable,and few of them show growth or new signs.
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