Subpulmonic pleural effusion
Right sided pleurtic chest pain and mild shortness of breath.
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Apparent elevation of the right hemidiaphragm.
The right base 'through the breast' is dense - note the different to the normal left side if observing through the breast as it hangs below the diaphragm.
A subpulmonic effusion is a pleural effusion that is only visualised in the erect projection. Rather than layering laterally and blunting of the costophrenic fluid it lies almost exclusively between the lung base and the diaphragm, giving the impression of an elevated diaphragm and density behind it.