In various conditions complicated with collections of fluid in the pleural sacs, the clinical observations of Grocco,1 Baduel and Siciliano,2 Rauchfuss,3 Thayer and Fabyan,4 Ewart,5 Morison6 and others, have established the constancy of an area of percussion dulness, roughly triangular in outline, lying along the spine, on the opposite side to that on which the fluid is found. This paravertebral triangular area of dulness appears to have a distinct value as a point in differential diagnosis between conditions of pulmonary consolidation, mediastinal growths, etc., and conditions, associated with pleural effusion. It has even been suggested7 that the paravertebral triangle of dulness is pathognomonic of the ordinary type of pleural effusion. Recently, however, attention has been called to the fact that triangular areas of dulness may be percussed along the spine in affections where the thorax is not the seat of the pathologic process.
SMITHIES F. PARAVERTEBRAL TRIANGLE OF DULNESS (GROCCO'S SIGN): IN A CASE OF ABDOMINAL MULTILOCULAR CYSTADENOMA. JAMA. 1908;L(19):1491–1492. doi:10.1001/jama.1908.25310450001001
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