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Dias OM, Baldi BG, Pennati F, Aliverti A, Chate RC, Sawamura MVY, Carvalho CRRD, Albuquerque ALPD. Computed tomography in hypersensitivity pneumonitis: main findings, differential diagnosis and pitfalls. Expert Rev Respir Med 2017; 12:5-13. [PMID: 29048936 DOI: 10.1080/17476348.2018.1395282] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
INTRODUCTION Hypersensitivity pneumonitis (HP) is a disease with variable clinical presentation in which inflammation in the lung parenchyma is caused by the inhalation of specific organic antigens or low molecular weight substances in genetically susceptible individuals. Alterations of the acute, subacute and chronic forms may eventually overlap, and the diagnosis based on temporality and presence of fibrosis (acute/inflammatory HP vs. chronic HP) seems to be more feasible and useful in clinical practice. Differential diagnosis of chronic HP with other interstitial fibrotic diseases is challenging due to the overlap of the clinical history, and the functional and imaging findings of these pathologies in the terminal stages. Areas covered: This article reviews the essential features of HP with emphasis on imaging features. Moreover, the main methodological limitations of high-resolution computed tomography (HRCT) interpretation are discussed, as well as new perspectives with volumetric quantitative CT analysis as a useful tool for retrieving detailed and accurate information from the lung parenchyma. Expert commentary: Mosaic attenuation is a prominent feature of this disease, but air trapping in chronic HP seems overestimated. Quantitative analysis has the potential to estimate the involvement of the pulmonary parenchyma more accurately and could correlate better with pulmonary function results.
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Affiliation(s)
- Olívia Meira Dias
- a Pulmonary Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
| | - Bruno Guedes Baldi
- a Pulmonary Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
| | - Francesca Pennati
- b Dipartimento di Elettronica, Informazione e Bioingegneria , Politecnico di Milano , Milan , Italy
| | - Andrea Aliverti
- b Dipartimento di Elettronica, Informazione e Bioingegneria , Politecnico di Milano , Milan , Italy
| | - Rodrigo Caruso Chate
- c Radiology Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
| | - Márcio Valente Yamada Sawamura
- c Radiology Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
| | - Carlos Roberto Ribeiro de Carvalho
- a Pulmonary Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
| | - André Luis Pereira de Albuquerque
- a Pulmonary Division, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina , Universidade de Sao Paulo , Sao Paulo , Brazil
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Hypersensitivity Pneumonitis: Lessons from the Great Imitator in Interstitial Lung Disease. Ann Am Thorac Soc 2017; 14:1506-1507. [DOI: 10.1513/annalsats.201707-590ed] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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