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Related Experiment Video

Updated: May 24, 2025

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
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Position-Dependent Lung Shadow Movement.

Tomohiro Bando1, Yumiko Sasaki1, Wataru Koike2

  • 1Department of Respiratory Medicine Gifu Prefectural Tajimi Hospital Tajimi Japan.

Respirology Case Reports
|March 3, 2025
PubMed
Summary

This case study reports a unique observation of mobile lung shadows during CT-guided needle aspiration biopsy in a patient suspected of autoimmune pulmonary alveolar proteinosis (PAP). The findings suggest novel diagnostic approaches for atypical lung opacities.

Keywords:
CTatypical lung shadowsinterstitial lung diseasepulmonary alveolar proteinosis

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Area of Science:

  • Pulmonology
  • Radiology
  • Immunology

Background:

  • Autoimmune pulmonary alveolar proteinosis (PAP) can present with atypical lung shadows.
  • Biomarkers like KL-6, SP-D, and GM-CSF antibodies may indicate PAP.
  • Diagnostic challenges exist for atypical pulmonary findings.

Purpose of the Study:

  • To report a unique case of mobile lung shadows observed during CT-guided needle aspiration biopsy (CT-NAB).
  • To highlight clinical considerations for patients with atypical lung shadows, particularly those suspected of PAP.
  • To emphasize the need for further research into the pathophysiology of lung shadows.

Main Methods:

  • Patient presentation with abnormal chest x-ray and elevated PAP biomarkers.
  • Initial diagnostic procedures including bronchoalveolar lavage and transbronchial lung biopsy.
  • CT-guided needle aspiration biopsy (CT-NAB) with real-time imaging to observe lung shadow mobility.

Main Results:

  • Ground-glass opacity (GGO) in the left lower lung showed positional mobility during CT-NAB.
  • Elevated KL-6, SP-D, and GM-CSF antibody levels suggested autoimmune PAP.
  • Nonspecific findings from initial biopsies complicated definitive diagnosis.

Conclusions:

  • Mobile lung shadows during CT-NAB represent a novel observation.
  • This finding may offer new insights into the diagnosis of atypical lung shadows and PAP.
  • Further studies are crucial to understand the pathophysiology and improve diagnostic accuracy for such cases.