Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Desquamative interstitial pneumonia
- Radiologic Findings
- Fig 1. Chest PA shows diffuse reticular opacities and ground-glass opacity in both lungs.
Fig 2,3. CT scans show bilateral ground-glass opacity, multiple cysts, and emphysema within the subpleural areas of ground-glass opacity in both lungs.
VATS biopsy specimen of the patient shows loose fibrosis and foamy macrophage accumulation in air space.
Fig 4,5. [after 3 months] In 3 months follow-up CT scan, ground-glass opacity has partially resolved after steroid therapy.

after 3 months

after 3 months
- Brief Review
- Desquamative interstitial pneumonia (DIP) is a rare form of idiopathic interstitial pneumonia (IIP). It is associated with heavy smoking. A diagnosis of DIP cannot be reliably established based on clinical and radiological features alone and ideally requires a lung biopsy. The histomorphology is characterized by the diffuse accumulation of numerous pigmented macrophages within most of the distal airspace of the lung and, sometimes, an admixture of eosinophils and/or giant cells.
The radiologic patterns are nonspecific and include patchy ground-glass opacities with a lower lung and peripheral predominance. The predominant abnormality at high-resolution CT in patients with DIP is ground-glass opacity, which may be peripheral, patchy, or diffuse in distribution. A peripheral subpleural and basal predominance of ground-glass opacity is most commonly seen. Honeycombing is uncommon. Coexistent emphysema may be present. At follow-up high-resolution CT of patients receiving treatment, the ground-glass opacity may show partial or complete resolution. Small cystic spaces may develop within the areas of ground-glass opacity, although progression to reticular abnormality and honeycombing is unusual. The differential diagnosis includes RB-ILD, hypersensitivity pneumonitis, NSIP, and atypical infections such as Pneumocystis carinii pneumonia.
- References
- 1. Merel E. Hellemons1,8,9, Catharina C. Moor1,8,9, Jan von der Thüsen et al., Desquamative interstitial pneumonia: a systematic review of its features and outcomes, Eur Respir Rev 2020; 29: 190181
2. Attili AK, Kazerooni EA, Gross BH, et al. Smoking-related Interstitial Lung Disease: Radiologic-Clinical-Pathologic Correlation. Radiographics. 2008;28(5):1383-96.
3. Iwasawa T, Takemura T, Ogura T. Smoking-related lung abnormalities on computed tomography images: comparison with pathological findings. Jpn J Radiol. 2018;36(3):165-180.
4. Ryu JH, Myers JL, Capizzi SA et-al. Desquamative interstitial pneumonia and respiratory bronchiolitis-associated interstitial lung disease. Chest. 2005;127 (1): 178-84.
- Please refer to
- Case 1247 Case 1214 Case 1157 Case 1149 Case 1127 Case 840 Case 620 Case 615 Case 266 Case 4
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- Keywords