Journal List > Tuberc Respir Dis > v.66(5) > 1001376

Lee, Choi, Seo, Na, Kim, Oh, and Jou: A Case of Congenital Cystic Adenomatoid Malformation of the Lng with Atypical Adenomatous Hyperplasia in Adult

Abstract

Congenital cystic adenomatoid malformation (CCAM), which is classified into five types according to size and bronchial invasion, is a rare type of developmental anomaly of the lung. CCAM is occasionally accompanied by malignancy, such as bronchioloalveolar carcinoma (BAC) or rhabdomyosarcoma. As defined by the WHO, atypical adenomatous hyperplasia (AAH) is a non-invasive spread of atypical epithelial cells in single rows along the alveolar wall, within a lesion that is usually less than 5 mm in diameter. AAH was also regarded as a pre-invasive neoplasia, especially associated with BAC and adenocarcinoma. We report a case of type II CCAM with AAH in adults, with a review of the references.

Figures and Tables

Figure 1
Chest PA shows cavitary nodule in left hilum.
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Figure 2
Chest CT shows diffuse ground glass opacity and multiple branching cystic lesion in left lung.
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Figure 3
The resected lung shows various sized cystic lesion (H&E stain, ×10).
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Figure 4
The lining cells are pseudostratified ciliated columnar cells to columnar and cuboidal cells like bronchiolar epithelial cells (H&E stain, ×100).
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Figure 5
Focal mucinous epithelial lesion with mild atypism is revealed in the intervening parenchyma (H&E stain, ×200).
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