Thoracic spine sign of pleural effusion on ultrasound
Known metastatic lung cancer. Dyspnea, left plerural effusion on chest x-ray.
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On B-mode ultrasound performed in a supine position the reflexion caused by the spine can be followed above the diaphragm due to a large pleural effusion. Atelectasis in the basal lung segments is also visible. Incidentally a small amount of free fluid can be observed around the spleen as well.
The thoracic spine sign is an easily recognizable indicator of large pleural effusion, particularly helpful for POCUS users.