Perkutory phenomenon in larger longitudinal or oval lung caverns containing fluids. Because the secrete mirror is always horisontal, there is a change of percussion note when the patient changes position.
Several authors describe this as being identical to Biermer’s sign, but that is strictly not correct.
- C. J. A. C. Gerhardt:
Lehrbuch der Auscultation und Percussion.
3rd edition, 1876.
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