Radiological imaging plays an important role in diagnosing and characterizing bronchiectasis. CT scanning is the most sensitive imaging method, allowing visualization of bronchial dilation, lack of tapering, wall thickening, mucus plugging, and cyst formation. Different patterns of bronchiectasis exist, including cylindrical, varicose, and cystic forms. Underlying causes like cystic fibrosis or post-infectious processes are often associated with specific locations of bronchiectasis within the lungs. Other imaging modalities like MRI, scintigraphy, and chest x-rays can provide supplemental information but have limitations compared to CT.

1. Radiological imaging of bronchiectasis.
Dr/ ABD ALLAH NAZEER. MD.

3. Clinical Findings:
Classical clinical triad: chronic cough, excess sputum production and repeated infection
Hemoptysis.
Shortness of breath.
Wheezing.
Fever is rare even with infection.

4. Morphological-types-of-bronchiectasis.

5. Imaging Findings
Location
Proximal, frequently upper lobe, bronchiectasis is characteristic of allergic
bronchopulmonary aspergillosis (ABPA)
Bronchiectasis from viral or pyogenic infections is usually at the bases
Tuberculous bronchiectasis is usually at the apices
Diffuse bronchiectasis
Impaired mucus clearing e.g. cystic fibrosis and Kartagener
Chronic diffuse airways disease (chronic bronchitis, asthma, bronchiolitis
obliterans
Immune deficiency states
CT is the study of choice with a sensitivity of up to 97% and a specificity up to 99%
Signet ring appearance on CT : normally, the vessel is larger than the corresponding
bronchus
In bronchiectasis, the bronchus is larger than the corresponding vessel
“Tramlines” or “honeycombing” represents dilated, thickened bronchial walls
Volume loss due to destruction of lung tissue
Multiple small nodular densities from plugged alveoli
Lack of normal, bronchial tapering
Non uniform bronchial dilation
Cystic lesions, often with air-fluid levels, and frequently in a cluster
Bronchial wall thickening.

6. MRI has potential in the imaging of bronchiectasis, particularly in
conditions such as CF, in which young patients may require serial
imaging for disease monitoring and assessment of response to
treatment. Compared to HRCT, the ability of MR to provide
functional imaging and lack of radiation could compensate for its
limited spatial resolution. With improvement in MRI techniques,
recent studies have shown good reproducibility and good
correlation with PFT results.
Further work is required to improve spatial resolution, develop
robust validated scoring systems and evaluate correlations with
clinical outcomes.
Currently cost, limited availability and limited spatial resolution limit
the use of MRI in bronchiectasis largely to the research arena.
Although hyperpolarized noble gas imaging has great potential in
terms of provision of functional data, technical issues and set-up and
ongoing costs suggest its role will be limited to research for the
foreseeable future.

7. Scintigraphy
Prior to the advent of HRCT, ventilation (with or without
perfusion) scintigraphy was used to aid disease evaluation in
bronchiectasis. DOLLERY and HUGH-JONES studied the
physiological implications of bronchiectasis and found reduced
blood flow and impaired ventilation in bronchiectatic areas.
V/Q scintigraphy typically demonstrates matched ventilation
and perfusion defects, reflecting abnormal ventilation
secondary to bronchiectasis and associated small airways
obstruction V/Q scintigraphy and lung function are additive
tools to aid diagnosis and guide therapeutic management. The
ongoing issue of radiation dose and absence of useful
anatomical information, however, limit the value of V/Q
scintigraphy in routine practice.

13. Chest radiography
Chest radiography (CXR) is usually the initial study performed in both
suspected bronchiectasis and the evaluation of nonspecific respiratory
symptoms, such as dyspnea and hemoptysis, when bronchiectasis may
be identified incidentally. Signs on CXR include the identification of
parallel linear densities, tram-track opacities, or ring shadows
reflecting thickened and abnormally dilated bronchial walls. These
bronchial abnormalities form a spectrum from subtle or barely
perceptible 5-mm ring shadows to obvious cysts. Tubular branching
opacities conforming to the expected bronchial branching pattern may
result from fluid or mucous filling of bronchi. Peribronchial fibrosis
results in a loss of definition of vessel walls.
Signs of complications/exacerbations, such as patchy densities due to
mucoid impaction and consolidation, volume loss secondary to
bronchial mucoid obstruction or chronic cicatrisation, are also seen. In
the more diffuse forms of bronchiectasis, such as cystic fibrosis (CF),
generalized hyperinflation and oligaemia are often present, consistent
with severe small airways obstruction.

14. Chest radiography showing a) cystic bronchiectasis with multiple cystic airspaces and
b) cylindrical bronchiectasis and tram track opacities in a cystic fibrosis patient.
(a) (b)

15. Chest radiographs: Demonstrate thin-walled, cystic structures in right
lower lobe (white arrow), some with air-fluid levels (yellow arrows).

18. Cystic bronchiectasis with air-fluid levels.

20. CT signs of bronchiectasis
Signet ring appearance on CT: normally, the vessel is larger than
the corresponding bronchus in bronchiectasis, the bronchus is
larger than the corresponding vessel.
Bronchial dilation, the cardinal sign of bronchiectasis, is
characterised on HRCT by a bronchoarterial ratio (BAR) of .1, lack
of bronchial tapering, and visibility of airways within 1 cm of the
pleural surface or abutting the mediastinal pleural surface.
“Tramlines” or “honeycombing” represents dilated, thickened
bronchial walls.
Volume loss due to destruction of lung tissue.
Multiple small nodular densities from plugged alveoli.
Lack of normal, bronchial tapering
Non uniform bronchial dilation
Cystic lesions, often with air-fluid levels, and frequently in a cluster
Bronchial wall thickening.

21. SIGNET RING SIGN. Chest CT shows small bronchiectasis.

22. SIGNET RING SIGN. Chest CT shows small bronchiectasis.

24. Bronchiectasis. Signet-ring sign.

25. Axial CT scan. Lower lobe
bronchiectasis. Signet-ring sign.
Axial CT scan. Lower lobe
bronchiectasis. Signet-ring sign.

26. High-resolution computed tomography image showing
non tapering bronchi, in keeping with bronchiectasis.
Lack of bronchial tapering.

27. Young adult with cystic fibrosis. Coronal CT scan.
Widespread bronchiectasis. Lack of bronchial tapering

28. Varicose bronchiectasis.
Varicose bronchiectasis with cystic bronchiectasis.

29. Varicose bronchiectasis.

30. Cylindrical bronchiectasis.
Cylindrical bronchiectasis.

31. Cylindrical bronchiectasis.

32. Categories of bronchiectasis. Normal bronchus (arrow) (A), cylindrical bronchiectasis with lack of bronchial tapering
(arrow) (B), varicose bronchiectasis with string-of-pearls appearance (arrow) (C), and cystic bronchiectasis (arrow) (D).
BA C
D
Abnormal bronchial contour.

34. *
High-resolution computed tomography image demonstrating bronchiectasis with
bronchial wall thickening (asterisk) and mucous plugging (arrow) in the right lower lobe.
Bronchial wall thickening

35. Inspiratory high-resolution computed tomography image showing bronchiectasis
and widespread areas of low attenuation, representing air-trapping.
Air-trapping Sign.

36. High-resolution computed tomography showing a) proximal bronchiectasis affecting
segmental airways and b) high attenuation mucous plugs in patients with allergic
bronchopulmonary aspergillosis. No intravenous contrast medium was used in (b).
a)
b)
Mucous plugs Impaction.

37. Cystic Bronchiectasis. CT: Markedly dilated bronchi are seen, some
with air-fluid levels (yellow arrows), mostly in the right lung.
Cystic changes with air-fluid levels.

38. High-resolution computed tomography
image showing cystic bronchiectasis.

39. Cystic Bronchiectasis. CT: Markedly dilated bronchi are seen, some with air-fluid levels.

40. Cystic Bronchiectasis. CT: Markedly dilated bronchi are seen, some with air-fluid levels.

41. Cystic Bronchiectasis. X-Ray and CT: Dilated bronchi are seen, some with air-fluid levels.

42. Cystic Bronchiectasis.

45. Endoluminal Obstruction by Tumor Most
carcinoid tumors are primarily endobronchial
lesions, occurring in the central, main, or
segmental bronchi. Some small tumors are
located entirely within the lumen. However,
some display a dominant extraluminal
component with only a small part of the
tumor lying within the airway (iceberg
lesion). A variety of other benign and
malignant neoplasms can also result in
obstruction leading to focal bronchiectasis.

46. Carcinoid. This predominantly endobronchial tumor, arising before bifurcation
of left upper and lower lobe bronchi, causes distal bronchiectasis. Transverse
images of tumor (arrow, A) and distal bronchiectasis (arrows, B).

47. Carcinoid. This predominantly endobronchial tumor, arising before bifurcation of
left upper and lower lobe bronchi, causes distal bronchiectasis. Coronal oblique
image (C) and volume-rendering reformation (D) in similar orientation as A and B
show central carcinoid tumor (arrows) and distal bronchiectasis (arrowheads, C).

48. Broncholithiasis Calcified or ossified material within
the bronchial lumen can cause focal bronchiectasis.
By far the most common cause of broncholithiasis is
erosion by and extrusion of a calcified adjacent lymph
node, usually associated with a long-standing focus of
necrotizing granulomatous lymphadenitis, especially
after tuberculosis. Nevertheless, the frequency of
broncholithiasis complicating granulomatous
infection is quite low. The most common sites are the
proximal right middle lobe bronchus and the origin of
the anterior segmental bronchus of the upper lobes
because of airway anatomy and lymph node
distribution.

49. Broncholithiasis. Calcified left upper lobe endobronchial broncholithiasis (arrow) from
previous tuberculosis exposure is seen on transverse image (A), minimum-intensity-
projection reformation in coronal oblique plane (B), and volume-rendering
reformation (C) in similar orientation. In C, arrow points to distal bronchiectasis.

50. Congenital stenosis of left mainstem bronchus. Transverse images show
stenosis (arrow, A), distal bronchiectasis, and mucoid impaction (arrows, B).
Airway stenosis causing focal bronchiectasis can result from a broad spectrum of entities including
infection, intubation stricture, healing of a tracheostomy stoma, tracheobronchopathia
osteochondroplastica, amyloidosis, relapsing polychondritis, sarcoidosis, and fibrosing mediastinitis.

51. Focal bronchiectasis (idiopathic) in left lower lobe (arrow).
Bronchial Atresia
The most common cause of
congenital focal bronchiectasis
is bronchial atresia,
characterized by obliteration
of a bronchus with distal
bronchiectasis, mucoid
impaction, and air trapping
that is most commonly seen in
the left upper lobe. In this rare
lesion, the bronchial tree
peripheral to the point of
obliteration is patent and the
lung parenchyma is
overinflated because of
collateral air drift.

52. Bronchial atresia. Transverse image of focal bronchiectasis (arrow) distal to
bronchial atresia associated with hyperlucency and hyperexpansion of left lung.

53. Post-radiation fibrosis. Right para-mediastinal fibrotic changes, which developed after
treatment of lung cancer, are associated with traction bronchiectasis (arrows).

54. Young adult with cystic fibrosis. Chronic
right upper lobe collapse (arrow)
Young adult female with cystic fibrosis. Long
standing middle and lingular collapse
(arrows) Background severe bronchiectasis.
Cystic Fibrosis The most common cause of congenital upper-lung-predominant bronchiectasis
is cystic fibrosis, commonly associated with enlarged lung volumes and interstitial alterations.
An autosomal recessive genetic disorder causing ineffective clearance of secretions, cystic
fibrosis presents with recurrent pneumonias, sinusitis, pancreatic insufficiency, and infertility.
Milder forms of cystic fibrosis, however, can remain unrecognized until adulthood.

55. Cystic fibrosis. Transverse (A) and coronal (B) images show upper
lobe predominance of cystic bronchiectasis (arrows) and volume
loss, enlarged lung volumes, and diffuse heterogeneous attenuation.

56. Young adult with cystic fibrosis. Arrow:
Cylindrical (tubular) bronchiectasis.
Elderly male with idiopathic pulmonary
fibrosis. Arrow: varicose bronchiectasis.

57. Sarcoidosis. Transverse images show fibrosis and traction bronchiectasis
(arrows, B) that predominantly involve upper lobes.
Sarcoidosis Parenchymal involvement by sarcoidosis can lead to upper and mid lung
fibrosis and traction bronchiectasis, typically associated with multiple nodules in a
perilymphatic distribution. Mediastinal and bilateral symmetric lymphadenopathy is
common, although it can regress as the interstitial disease worsens

58. Kartagener's syndrome. Transverse CT image confirms dextrocardia (asterisk is in left
ventricle) and bronchiectasis (arrows) that predominantly affects midportion of lungs.
Immobile Cilia Syndrome This rare congenital cause of bronchiectasis, which
primarily involves the middle lung, is characterized by ineffective clearing of secretions,
causing bronchiectasis, recurrent pneumonias, sinusitis, and infertility. In 50% of cases,
total situs inversus is present, a condition known as Kartagener's syndrome.

59. Mounier-Kuhn's syndrome. Enlarged mainstem bronchi
(black arrows) and distal bronchiectasis (white arrows).

60. Mounier-Kuhn syndrome, also known as tracheobronchomegaly, is a rare
congenital abnormality of the trachea and main bronchi characterized by
cystic dilatation of the tracheobronchial tree and recurrent respiratory infections.

61. Mounier-Kuhn Syndrome. Two axial CT images of the thorax demonstrate marked dilatation of the
trachea (T) and right (R) and left (L) main bronchi in this patient with Mounier-Kuhn syndrome. Notice
the bronchiectasis (red arrows and red circle) in which the bronchi are larger than their accompanying
blood vessel and there is tram=tracking of thickened bronchial walls seen in profile.

62. Elderly male with COPD and upper lobe bronchiectasis
and scarring. New hemoptysis. Questionable soft tissue
nodule within a left upper lobe bullous (arrow).
Axial CT scan on lung windows. Mycetoma
within the left upper lobe bullous (arrow).

63. Coronal reformat demonstrating bilateral upper lobe bullae,
scarring and bronchiectasis with a fungus ball on the left (arrow).

64. MPR in MIP demonstrates hypervascular area of bronchiectasis with multiple
cysts containing air mucus at postero basal segment of left lower lobe.

65. MPR (oblique section) in MIP demonstrates area
of bronchiectasis at posterior basal segment.

66. MPR (axial section) in MIP demonstrates areas of
bronchiectasis at posterior basal segments at both sides.

67. CT show marked dilatation of the trachea, left and right bronchi with
multiple diverticula (arrow heads), and bilateral cystic bronchiectasis.

69. HRCT features of NSIP include extensive ground-glass areas in the lung (black arrows) and
traction bronchiectasis. This bronchiectasis frequently shows a parallel course through the lung,
well depicted by sagittal reconstruction in D (black dotted arrows). There is no honeycombing in
the lung. Cystic bronchiectasis is generally well documented by MPR images

70. Cystic bronchiectasis in middle lobe. Chest x ray and MDCT (axial, coronal and sagittal).

71. Bilateral cystic bronchiectasis.

72. Vascular abnormalities.
Dilated bronchial arteries. These are best
demonstrated post administration of intravenous
contrast. These tortuous vessels extend along the
central airways toward the hila. It is these vessels that
are often responsible for hemoptysis, a symptom
these patients may describe.
Dilated main pulmonary artery. This usually indicates
underlying pulmonary hypertension as a sequelae of
chronic, severe lung disease.
Other findings
Lobar collapse.
Mycetoma formation (Fungus ball)
Aspergillus fumigatus is a fungus that may colonise dilated
airways or bullae/cavities. It is an important cause of
hemoptysis.

73. Contrast enhanced CT scan in a coronal reformat. Dilated
bronchial arteries course through the mediastinum. (arrows).

74. Coronal reconstruction from high-resolution computed
Tomography showing a bronchial collateral vessel.

75. a) Transverse magnetic resonance (T2-weighted half-Fourier acquisition single-shot turbo spin
echo (HASTE)) image and b) corresponding computed tomography image in a 14-year-old female
with cystic fibrosis. In both images, bronchial wall thickening, bronchiectasis, peripheral mucous
plugging and dorsal consolidations are demonstrated, as shown by the arrows.

76. Bilateral upper lobes cystic bronchiectasis with air fluid level, MRI images.

77. MRI images with cystic bronchiectasis.

78. T1-weighted magnetic resonance imaging showing appearance a) before and b) after
contrast medium in a 43-year-old cystic fibrosis patient. The post-contrast images
demonstrate extensive bronchial wall enhancement and permit differentiation of a thickened
wall from intrabronchial secretions, with intrabronchial fluid having an air–fluid level (arrow).

79. Diagnostic approach to bronchiectasis.

80. Thank You.