9%20ECOGRAFIA%20ABDOMINAL%20COMO%20CUANDO%20DONDE

204
ABDOMINAL ULTRASOUND
IVC
C
A
B
Medial wing
Lateral wing
Medulla
Cortex
LK
c
RK
C
D
E
Figure 8.7 (A) Right adrenal. The medial (anterior arrow) and lateral (posterior arrow) wings of the gland lie just
anterior to the crus, C. (B) The medial ridge of the right adrenal (arrows) is seen anterior to the diaphragmatic crus
(arrowheads) and posterior to the IVC. (C) Transverse right adrenal (arrow) between the IVC and crus (arrowheads).
(D) The two hypoechoic wings of the left adrenal (arrows) can be seen in the space between the spleen, left kidney (LK)
and the crus, c. (The dynamic range has been reduced to appreciate the gland better.) (E) Section through the right
adrenal gland.
Myelolipoma
The adrenal myelolipoma is found, uncommonly,
as an incidental mass. It is highly echogenic and
well-defined, due to its fatty content (Fig. 8.8C).
These are relatively rare, require no further
management, and are endocrinologically nonfunctioning.
Phaeochromocytoma
The phaeochromocytoma is uncommon, but may
be found in up to 1% of patients with hypertension.
It is a tumour arising in the chromaffin cells of the
adrenal medulla (most commonly) or in autonomic
nervous tissue. It may be bilateral and appears solid
on ultrasound, although larger masses may have