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MALIGNANT RENAL TUMORS PRODUCING CORTICAL RETRACTION: "THE DIMPLE SIGN"

HAROLD A. BALTAXE M.D., THOMAS A. SOS M.D., and GEORGE F. GRAY JR. M.D.

Four angiographically avascular renal tumors (3 hypernephromas and 1 hypernephroma developing in association with a renal cyst) are reported.

In all cases, retraction of the cortex on the side of the tumor was noted. The retraction was probably due to the peripheral location of the tumor and the production of atrophy of normal renal parenchyma adjacent to the tumor. The "dimple sign" has been coined by us to describe the retraction of the cortex.

The dimple sign is not related to the avascular character of the tumor by angiography, and could also be seen in socalled vascular tumors.

We suggest that in the presence of a dimple sign, malignancy must be excluded.


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