Ultrasound and interstitial lung disease: use and limitations.

The Connective Tissue Diseases (CTDs)-related Interstitial Lung Disease (ILD) early diagnosis by Transthoracic Ultrasound (TUS) still arises several issues. Gutierrez et al. clearly underlined the current role of ultrasound artifacts for ILD definition according to some Authors. In this Letter to the Editor, we would like to highlight the proper role of TUS and its pitfalls.

Safety maximization of percutaneous transthoracic needle biopsy with ultrasound guide in subpleural lesions in the evaluation of pulmonary consolidation.

The study by Kiranantawat et al. "Clinical role, safety and diagnostic accuracy of percutaneous transthoracic needle biopsy in the evaluation of pulmonary consolidation" highlights how "pulmonary consolidation can be safely evaluated with CT-guided percutaneous needle biopsy". Even if we agree about the role of CT guidance, we would like to point out how Thoracic Ultrasound could be better than CT for biopsy of subpleural lesions that could easily be detected and reached with this "real-time" and quicker technique.

Thoracic ultrasound combined with low-dose computed tomography may represent useful screening strategy in highly exposed population in the industrial city of Taranto (Italy).

Objectives: We validated a screening protocol in which thoracic ultrasound (TUS) acts as a first-line complementary imaging technique in selecting patients which may deserve a second-line low-dose high resolution computed tomography (HRCT) scan among a population of asymptomatic high-risk subjects for interstitial lung abnormalities (ILA) and lung cancer. Due to heavy environmental pollution burden, the district Tamburi of Taranto has been chosen as "case study" for this purpose. Methods: From July 2018 to October 2020, 677 patients aged between 45 and 65 year and who had been living in the Tamburi district of Taranto for at least 10 years were included in the study. After demographic, clinical and risk factor exposition data were collected, each participant underwent a complete TUS examination. These subjects were then asked to know if they agreed to perform a second-level examination by low-dose HRCT scan. Results: On a total of 167 subjects (24.7%) who agreed to undergo a second-level HRCT, 85 patients (50.9%) actually showed pleuro-pulmonary abnormalities. Interstitial abnormalities were detected in a total of 36 patients on HRCT scan. In particular, 34 participants presented subpleural ILAs, that were classified in the fibrotic subtype in 7 cases. The remaining 2 patients showed non-subpleural interstitial abnormalities. Subpleural nodules were observed in 46 patients. TUS showed an overall diagnostic accuracy of 88.6% in detecting pleuro-pulmonary abnormalities in comparison with HRCT scan, with a sensitivity of 95.3%, a specificity of 81.7%, a positive predictive value of 84.4% and a negative predictive value of 94.4%. The matched evaluation of specific pulmonary abnormalities on HRTC scan (i.e., interstitial abnormalities or pulmonary nodules) with determinate sonographic findings revealed a reduction in both TUS sensibility and specificity. Focusing TUS evaluation on the assessment of interstitial abnormalities, a thickened pleural line showed a sensitivity of 63.9% and a specificity of 69.5%, hypoechoic striae showed a sensitivity of 38.9% and a specificity of 90.1% and subpleural nodules showed a sensitivity of 58.3% and a specificity of 77.1%. Regarding to the assessment of subpleural nodules, TUS showed a sensitivity of 60.9% and a specificity of 81.0%. However, the combined employment of TUS examination and HRCT scans allowed to identify 34 patients with early subpleural ILA and to detect three suspicious pulmonary nodules (of which two were intraparenchymal and one was a large subpleural mass), which revealed to be lung cancers on further investigations. Conclusion: A first-line TUS examination might aid the identification of subjects highly exposed to environmental pollution, who could benefit of a second-line low-dose HRCT scan to find early interstitial lung diseases as well as lung cancer. Protocol registration code: PLEURO-SCREENING-V1.0_15 Feb, 17.

Video-assisted thoracic surgery ultrasound (VATS-US) in the evaluation of subpleural disease: preliminary report of a systematic study.

We provide a pictorial essay examining the preliminary data of an ongoing study whose primary aim is to assess the usefulness and safety of video-assisted thoracic surgery ultrasound (VATS-US) in the identification of different lung diseases. We studied 14 patients (five women and nine men with a mean age of 56.2 ± 8.4 SD years) with indication for VATS. All patients underwent pre-operative imaging of the chest using high-resolution computed-tomography, contrast-enhanced computed-tomography, and/or positron emission tomography and transthoracic ultrasound. VATS-US was performed under general anesthesia with single-lung ventilation through double-lumen endotracheal intubation in all patients, and the Esaote MyLab 25 laparoscope probe with flexible tip and a linear array transducer at frequencies 8.0-12.0 MHz was used. The final histological diagnoses in our cohort were cancer (three cases), usual interstitial pneumonia (five cases), nonspecific interstitial pneumonia (two cases), and hypersensitivity pneumonitis (one case). In patients with pulmonary fibrosis, the VATS-US showed a thick hyperechoic pleural line and no B-lines. Regarding cancer nodules, the VATS-US images showed a uniform hypoechogenic pattern with jagged margins. In patients with hamartochondroma and histocytosis X, VATS-US showed a mixed hyperechoic structure of the margins. In conclusion, we described the US semeiotics of various lung disorders assessed during VATS by reporting the preliminary data of the first study which applies the methodology systematically to all patients undergoing the surgery procedure. Final results from the study will further elucidate how the technique could be of use during the VATS procedure.

Count of B-lines: a reappraisal. Comment on "Visual versus automatic ultrasound scoring of lung B-lines: reliability and consistency between systems".

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Transthoracic ultrasound sign in severe asthmatic patients: a lack of "gliding sign" mimic pneumothorax.

Transthoracic ultrasound (TUS) is a validate complementary technique widely used in everyday medical practice. TUS is the gold-standard for studying pleural effusion and for echo-guided thoracentesis, moreover, it is employed in detection of pleural and pulmonary lesions adherent to pleural surface and their ccho-guided percutaneous needle biopsy (PTNB).1 We used TUS technique to study severe asthma patients. We found that several patterns are constant in these patients. One of these patterns, i.e. lack of gliding sign, mimic pneumothorax (PNX). In this study, we attempted an echographic approach to asthma, trying to lay the first stone for the individuation of common ultrasound patterns in this disease.