Elementary Lesions
Elementary Lesions
Centrilobular Micronodulation
Branching Centrilobular Micronodulations (Tree-in-Bud Pattern) of Bronchiolar origin are associated with different conditions
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Infectious bronchiolitis
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tuberculosis, atypical mycobacteria, cytomegalovirus, Aspergillus, Candida, and other bacteria
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Aspiration, inhalation (gas, smoke)
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Follicular bronchiolitis
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Sjögren’s syndrome, rheumatoid arthritis, immune system deficiencies
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Bronchiectasis, cystic fibrosis, primary ciliary dyskinesia, allergic bronchopulmonary aspergillosis, panbronchiolitis, constrictive bronchiolitis
Centrilobular Micronodules can also be associated with vascular and perivascular diseases
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Vasculitis (granulomatosis with polyangiitis, eosinophilic granulomatosis with polyangiitis)
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Endovascular metastases
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Pulmonary haemorrhage
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miliary mycosis (aspergillosis, candidosis)
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virosis (herpes, Cytomegalovirus)
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Centrilobular Micronodulation
Centrilobular Micronodulation
Bilateral micronodules sparing the subpleural lung.
Axial MIP image shows tree-in-bud pattern in a bilateral distribution.
References
References
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Collège des Enseignants de Pneumologie. Item 206 (ex item 120). Pneumopathies interstitielles diffuses. 2013
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Cottin V, et al. French practical guidelines for the diagnosis and management of idiopathic pulmonary fibrosis - 2017 update. Full-length version. Rev Mal Respir 2017;34:900-68
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Brauner M, et al. Imagerie des pneumopathies diffuses. Press Med 2010 39: 73-84
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Raghu G, et al. Diagnosis of Idiopathic Pulmonary Fibrosis. An Official ATS/ERS/JRS/ALAT Clinical Practice Guideline. Am J Respir Crit Care Med 2018;198:e44-e68