Background:
Bronchoscopy and CT thorax are the most common investigations utilized
to screen and diagnose lung cancer. Their individual utility in diagnosing lung cancer has
been described affirmatively in existing literature. Studies correlating the airway characteristics of
the two modalities in lung cancer are limited.
Objectives:
To analyze and characterize lung lesions bronchoscopically and correlate the same radiologically
by CT of the thorax and thus assess its positive predictive value.
Methods:
In this prospective study, 56 consecutive adults who presented to the Respiratory
Medicine Department at a tertiary care hospital in South India from November 2018 to June 2020,
having Clinico-radiological suspicion of malignancy and fulfilling study criteria, were recruited.
They were subjected to CECT of thorax and bronchoscopy. All bronchoscopic procedures were
performed using a protocolized number of passes for biopsy. The baseline demographic and clinical
data, findings of bronchoscopy and CT and biopsy reports were recorded. Cohen’s kappa coefficient
was used to estimate the agreement of findings on the two modalities. Statistical analysis
was performed using SPSS software.
Results:
Bronchoscopy was normal in 22.14% of cases, the corresponding CTs also revealed normal
airway. Bronchoscopy revealed airway lesions in 78.6% of cases; the corresponding CT revealed
airway abnormalities in only 46.41% of cases; among these, 52.1% of cases revealed an
exophytic growth. There was fair strength of agreement for the two modalities in the detection of
airway lesions of lung cancer. (k = 0.38, p = <0.001). CECT thorax has a negative predictive value
of 44%, a sensitivity of 59.1% and a specificity of 100% at 95% CI in the detection of airway
lesions.
Conclusion:
CT may not be definitive in the evaluation of lung cancer, especially in those with
central disease. A combination of the two modalities may improve the diagnostic outcome in patients
with lung cancer.