cicatricial atelectasis
2. Findings
cicatricial atelectasis
traction bronchiectasis
GGO
subpleural sparing

59-year-old male presents with history of scleroderma, Raynaud’s disease, and ILD
Upper Image
Axial CT shows bronchiectasis, and bronchiolectasis with crowding of the bronchovascular bundles posteriorly (green arrowheads) with volume loss (note fissural displacement -pink arrowheads). There is subpleural sparing posteriorly (blue arrowheads) Minor changes of peripheral reticular changes (black arrowheads), and minimal ground glass changes are present. An air-fluid level is present in the distended esophagus indicating reflux (yellow arrowhead).
The lower image focuses on the traction bronchiectasis caused by the fibrotic process
Ashley Davidoff MD TheCommonVein.net 110Lu 136598cL
| Finding | Definition | Comment |
|---|---|---|
| Cicatricial Atelectasis |
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| Traction Bronchiectasis |
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| Ground-Glass Opacity (GGO) |
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| Subpleural Sparing |
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Other Images from this Case ( 110Lu )

59-year-old male presents with history of scleroderma, Raynaud’s disease, and ILD
Coronal CT shows bibasilar volume loss, reticular change, ground glass changes, bronchovascular thickening , bronchiectasis, and subpleural sparing, all features characteristic of NSIP
.
The lower image highlights the bronchovascular thickening volume loss bronchiectasis and subpleural sparing. The fibrotic process has resulted in traction of the secondary lobules in the region of subpleural sparing
Ashley Davidoff MD TheCommonVein.net 110Lu 136592c01
3. Diagnosis
Clinical context with a focus here on Cicatricial Atelectasis:
Cicatricial atelectasis, also known as contraction or cicatrization atelectasis, is a form of lung collapse resulting from scarring or fibrosis of the lung tissue. This condition is irreversible and leads to a reduction in lung volume. It occurs when scar tissue contracts, preventing the alveoli (the tiny air sacs in the lungs) from expanding properly. Common causes include chronic inflammatory and granulomatous diseases such as tuberculosis, sarcoidosis, and idiopathic pulmonary fibrosis, as well as radiation-induced lung injury. Unlike other forms of atelectasis that may be caused by blockages or external pressure, cicatricial atelectasis is due to intrinsic changes within the lung parenchyma itself. While small areas of atelectasis may be asymptomatic, more extensive involvement can lead to symptoms like shortness of breath (dyspnea), coughing, and chest pain. On imaging, it is characterized by volume loss, often with a shift of fissures or the mediastinum, and crowding of bronchi and blood vessels in the affected area.
Cicatricial Atelectasis
| Cicatricial Atelectasis: A Deeper Dive | Key Points (bulleted) |
|---|---|
| Definition & Pathophysiology |
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| Imaging Manifestations (HRCT) |
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| Significance in Fibrotic Lung Disease |
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Causes of Pulmonary Fibrosis Leading to Cicatricial Atelectasis
| Cause | Pathogenesis of Fibrosis |
|---|---|
| Fibrotic Nonspecific Interstitial Pneumonia (NSIP) |
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| Usual Interstitial Pneumonia (UIP) / Idiopathic Pulmonary Fibrosis (IPF) |
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| Tuberculosis (Post-Primary) |
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| Radiation-Induced Lung Injury |
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| Sarcoidosis (Stage IV) |
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| Chronic Hypersensitivity Pneumonitis (HP) |
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4. Medical History and Culture
6. MCQs
Part A — Questions
| Question | Choices |
|---|---|
| Q1. Which mechanism most directly generates the macroscopic parenchymal traction that characterizes cicatricial (contraction) atelectasis? |
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| Q2. On histopathology, which combination most reliably predicts irreversible contraction rather than potentially reversible organizing pneumonia? |
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| Q3. A 62-year-old with prior upper-lobe TB presents with chronic dyspnea and tracheal deviation toward the right apex. Which PFT profile best fits cicatricial atelectasis? |
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| Q4. After successful treatment of necrotizing pneumonia, HRCT shows persistent right upper-lobe fibrotic volume loss with an elevated right hemidiaphragm. Over 6–12 months, which course is most likely without antifibrotic remodeling? |
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| Q5. Which HRCT pattern most specifically indicates cicatricial atelectasis rather than pure obstructive or compressive collapse? |
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| Q6. In a patient with prior asbestos-related pleural disease, which finding favors parenchymal cicatricial atelectasis over rounded atelectasis? |
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| Q7. After breast/chest-wall radiotherapy, what CT evolution best defines radiation-induced cicatricial atelectasis? |
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Part B — Answers & Explanations
Q1. Which mechanism most directly generates the macroscopic parenchymal traction that characterizes cicatricial (contraction) atelectasis? |
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| A) Surfactant depletion with alveolar microatelectasis during sleep | ✗ Incorrect | • Alters stability but does not produce fixed contraction |
| B) Chronic airway smooth-muscle shortening from cholinergic tone | ✗ Incorrect | • Bronchomotor tone causes variable obstruction, not fibrotic tethering |
| C) TGF-β–driven myofibroblast stress–fiber contraction transmitting force through collagen I/III to retract lung units | ✓ Correct | • Actin–myosin tension + ECM cross-linking → macroscopic retraction • King, N Engl J Med 2011 |
| D) Pleural elastic recoil exceeding transpulmonary pressure at end-expiration | ✗ Incorrect | • Explains passive/compressive collapse, not cicatricial pull |
Q2. On histopathology, which combination most reliably predicts irreversible contraction rather than potentially reversible organizing pneumonia? |
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| A) Intraluminal fibroblastic polyps (Masson bodies) without matrix cross-linking | ✗ Incorrect | • Organizing pneumonia is often reversible with steroids |
| B) Predominant edema with scattered neutrophils and type II cell hyperplasia | ✗ Incorrect | • Acute injury pattern; not predictive of fixed retraction |
| C) Mucus impaction with distal airspace collapse and preserved interstitium | ✗ Incorrect | • Obstructive/resorptive pathophysiology |
| D) Fibroblast foci with dense, cross-linked collagen and elastin remodeling bridging to pleura/airways | ✓ Correct | • Indicates matured fibrosis capable of traction • Katzenstein, Am J Surg Pathol 1997 |
Q3. A 62-year-old with prior upper-lobe TB presents with chronic dyspnea and tracheal deviation toward the right apex. Which PFT profile best fits cicatricial atelectasis? |
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| A) Normal TLC with elevated RV/TLC and significant bronchodilator response | ✗ Incorrect | • Hyperinflation/air-trapping pattern (small-airways disease) |
| B) Reduced TLC and FVC with minimal reversibility; DLCO low-to-normal depending on fibrosis burden | ✓ Correct | • Restrictive volumes from volume loss; limited reversibility • ATS/ERS PFT interpretation, Eur Respir J 2005 |
| C) Isolated low DLCO with normal volumes and flows | ✗ Incorrect | • Disproportionate for pure cicatricial volume loss |
| D) Variable obstruction with marked FeNO elevation only | ✗ Incorrect | • Suggests eosinophilic airway inflammation (asthma) |
Q4. After successful treatment of necrotizing pneumonia, HRCT shows persistent right upper-lobe fibrotic volume loss with an elevated right hemidiaphragm. Over 6–12 months, which course is most likely without antifibrotic remodeling? |
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| A) Normalization of hemidiaphragm position within weeks following incentive spirometry | ✗ Incorrect | • IS improves recruitment, not fixed scar position |
| B) Progressive descent of the right hemidiaphragm due to collateral ventilation | ✗ Incorrect | • Volume loss tends to keep the diaphragm elevated |
| C) Persistent elevation with small compensatory hyperinflation of uninvolved lobes; structural distortion remains | ✓ Correct | • Cicatricial changes are chronic; compensation is limited • Webb, AJR 1993 |
| D) Complete reversal after short-acting bronchodilator therapy alone | ✗ Incorrect | • Bronchodilators do not reverse fibrosis |
Q5. Which HRCT pattern most specifically indicates cicatricial atelectasis rather than pure obstructive or compressive collapse? |
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| A) Fissure retraction toward scar with bronchovascular crowding and traction bronchiectasis in a volume-lost segment | ✓ Correct | • Architectural distortion + retraction define contraction • Fleischner Glossary, Radiology 2008 |
| B) Expiratory mosaic attenuation without fissural shift and normal inspiratory volumes | ✗ Incorrect | • Favors small-airways disease |
| C) Smooth pleural effusion with ipsilateral passive atelectasis and mediastinal shift away | ✗ Incorrect | • Compressive mechanism |
| D) Central bronchial cutoff with lobar collapse that rapidly re-expands post-suction | ✗ Incorrect | • Obstructive/resorptive collapse |
Q6. In a patient with prior asbestos-related pleural disease, which finding favors parenchymal cicatricial atelectasis over rounded atelectasis? |
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| A) Pleural-based mass with comet-tail sign of curving vessels/bronchi into the lesion | ✗ Incorrect | • Classic for rounded atelectasis |
| B) Pleural thickening with adjacent volume loss and an acute pleuroparenchymal angle | ✗ Incorrect | • Still typical of rounded atelectasis |
| C) Subpleural folded lung forming a rounded configuration contiguous with thickened pleura | ✗ Incorrect | • Rounded atelectasis morphology |
| D) Linear/lamellar fibrotic bands retracting fissures and airways without a pleural-based rounded mass | ✓ Correct | • Parenchymal scar traction without pleural “comet-tail” mass • Aberle, Radiology 1988 |
Q7. After breast/chest-wall radiotherapy, what CT evolution best defines radiation-induced cicatricial atelectasis? |
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| A) Diffuse centrilobular nodules with air-trapping sparing the irradiated portal | ✗ Incorrect | • Not portal-conforming fibrosis |
| B) Late straight-edged fibrosis conforming to the beam with traction bronchiectasis and fixed volume loss (6–12 months) | ✓ Correct | • Beam-shaped fibrosis + traction = contraction pattern • Mehta, Chest 2005 |
| C) Rapid lobar reinflation after bronchoscopy within days | ✗ Incorrect | • Obstructive etiology |
| D) Random nodular opacities resolving completely in 48 hours | ✗ Incorrect | • Too acute; favors infection/aspiration |
7. Memory Page
Mnemonic: Cicatrization Atelectasis and Traction Bronchiectasis This animated mnemonic (GIF) depicts the lung bases with two muscular figures, one on each side. The figures are shown pulling inward on the segmental and subsegmental airways, causing them to become distorted, dilated, and collapsed. This action also results in surrounding ground-glass opacities (GGO), subpleural sparing, and reticulation. The muscular figures personify the intense cicatrization (scarring) forces of pulmonary fibrosis. This inward pull leads to cicatrization atelectasis (collapse due to scarring) and traction bronchiectasis (irreversible airway dilatation caused by the surrounding fibrotic tissue pulling the walls apart). The GGOs, reticulation, and subpleural sparing are classic CT findings of inflammatory fibrotic lung diseases, such as the nonspecific interstitial pneumonia (NSIP) pattern often seen in antisynthetase syndrome. (Takahashi K, et al. Ann Am Thorac Soc. 2018;15(Suppl 4):S283-S289. PMID: 30513028) This mnemonic visualizes how fibrotic (cicatrizing) forces pull on airways, causing the traction bronchiectasis and atelectasis characteristic of advanced fibrotic lung disease. Ashley Davidoff Art, AI-assisted — Memory Image – TheCommonVein.com (136598c04.MAD.01)
The Scarring Force
Two figures pull
With all their might
Drawing airways
Into the night
They twist and pull
With fibrotic grace
Collapsing lobules
In this scarred space
A traction pull
A widened view
Bronchiectasis
Something new
Atelectasis
From the strain
A lung’s collapse
A fibrotic pain
With ground-glass haze
And sparing seen
A classic
NSIP routine.




