CXR - Cavity in Lung

1. IMAGING OF THE WEEKIMAGING OF THE WEEK
DR. PRIYA KUBENDIRAN
M1 UNIT
PROF. DR. RAMASAMY

4. •CXR PA view
•Adequate exposure
•Soft tissue & bony shadow normal
•Trachea in midline
•Heart shadow normal
•Lung parenchyma - a wedge shaped opacity seen
in superior part of Rt lower zone with a thick
walled irregular cavity
•Lateral view – wedge shaped opacity
corresponding to right middle lobe with a cavity
with ectatic changes with associated collapse

5. •IMPRESSION
A thick walled cavity right middle lobe with
ectatic changes with associated collapse
? PT sequelae
? malignancy

8. CAVITY
A gas containing space within the lung surrounded by a
complete wall ≥ 1 mm in thickness
Occurs when an area of necrosis communicates with a
patent airway
Features : 1) location
2) wall thickness
3) outline
4) fluid level
5) contents
6)surrounding lung
7) multiplicity

9. ETIOLOGY
 Infectious : bacterial
fungal
parasites
Immunologic : Wegener’s granulomatosis
sarcoidosis
Neoplastic : primary neoplasms
haematogenous metastases
Thromboembolic : septic thromboembolism
Airways disease : bullae
cystic bronchiectasis
Traumatic : traumatic lung cyst
Developmental : sequestrated segment
bronchogenic cyst

10. • Acute abscesses
• Neoplasms
• Metastases
• Wegener’s
granulomatosis
• Rheumatoid nodules
• Bullae
• Pneumatocoeles
• Cystic bronchiectasis
• Chronic inactive TB
• Hydatid cysts
• Traumatic lung cysts

11. Acute lung
abscess
Primary
malignancy
Post traumatic
lung cyst
Metastases
Wegener’s
granulomatosis
Septic emboli

12. Klebsiella
S.pneumoniae
TB
Fungal
Carcinoma
Bullae
Sarcoidosis
 Ps.aeruginosa
TB
Hydatid cyst
Septic
thromboembolism
Bronchiectasis
Staph.aureus
Wegener’s
Metastases

13. PSEUDOCAVITATION /
BUBBLE LUCENCIES
•In HRCT, round/oval areas of low attenuation ≤ 5 mm
in diameter are visible within lung nodules
•Seen in bronchoalveolar ca (60 %)
acinar cell carcinoma (30 %)
•Represent 1) patent bronchi
2) air containing cystic spaces
•If ≥ 5 mm : 1) paracicatricial emphysema
2) localised bronchiectasis
3) tumor developing in an area of fibrosis &
honeycombing

14. Bubble lucency
Pseudocavity

15. Water lily sign
Hydatid cyst

16. Fungal ball

17. Wegener’s
granulomatosis

18. SCC