Lung point in the absence of pneumothorax
KeywordsUltrasound Lung point Lung sliding Pneumothorax Asbestos
Scanning at the right anterior third intercostal space showed absence of lung sliding (online video A), A-line and stratosphere sign indicating an A′-profile. Thus, a lung point was actively searched for and indeed found. Pneumothorax was ruled out by the presence of a B-line in the same view as the lung point (online video B), a post-operative chest X-ray and CT scan which indicated the pre-existence of asbestos-related pleural disease (Fig. 1a, c, d). We postulate that the healthy part of the lung moves unrestrictedly whereas the affected part is restricted, their transition resulting in a lung point. Another situation where lung point may be false positive is a ‘bleb’ point in bullous lung disease.
In conclusion, absent lung sliding and lung point can be observed in cases of pleural thickening and adhesion and may thus warrant revision of the perception that lung point is pathognomonic for pneumothorax.
TSS, BH, PWGE and PRT contributed substantially to the study design and the writing of the manuscript.
Compliance with ethical standards
The commission for medical ethics (METc) of VUmc has approved this research: METC: 2016.053.
Written informed consent was given by the patient.
Conflicts of interest
The authors declare they have no conflict of interest relevant to this manuscript.
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