"Lying-Down" Adrenal Sign: There Are Exceptions to the Rule Among Fetuses and Neonates.

Autor: Majmudar A; Department of Radiology, University of Tennessee Health Science Center, Memphis, Tennessee USA; and Department of Radiology, LeBonheur Children's Hospital, Memphis, Tennessee, USA., Cohen HL; Department of Radiology, University of Tennessee Health Science Center, Memphis, Tennessee USA; and Department of Radiology, LeBonheur Children's Hospital, Memphis, Tennessee, USA.
Jazyk: angličtina
Zdroj: Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine [J Ultrasound Med] 2017 Dec; Vol. 36 (12), pp. 2599-2603. Date of Electronic Publication: 2017 Jul 08.
DOI: 10.1002/jum.14315
Abstrakt: A linear-shaped or "lying-down" adrenal gland is a sign often seen with the absence of the kidney in the renal fossa due to renal agenesis, renal ectopia, or horseshoe kidney. It is theorized that the presence of the kidney in the normal location within the renal fossa is important for the formation of the normal triangular inverted V or Y adrenal shape. There are exceptions to this rule whereby a kidney is missing from the renal fossa, yet a normal adrenal shape is present. This series looked at 18 cases of an empty renal fossa in fetal, neonatal, and pediatric patients and recorded the shape of the adrenal gland. Nine cases (50%) appropriately showed the linear or lying-down adrenal gland; 6 (33%) showed an exception to the rule, with a normally shaped adrenal gland; and 3 (17%) showed a pseudo exception in which the adrenal gland was linear but blended with the diaphragmatic crus to simulate a triangular adrenal gland. The sonographic characteristics of the crus are different from those of the adrenal gland; thus, this pseudo exception can be avoided by careful inspection. Because the absence of the kidney is often a difficult diagnosis, the lying-down adrenal gland sign can be a helpful secondary sign for confirming that a kidney is absent or ectopic in position and not within the renal bed.
(© 2017 by the American Institute of Ultrasound in Medicine.)
Databáze: MEDLINE
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