Look at this question answered yesterday:

http://www.proz.com/kudoz/2002256


Examples:

[PDF] Ultrasonographic findings in the livers of patients with ...
File Format: PDF/Adobe Acrobat
The echo texture of the hepatic parenchyma in. all patients with lepromatous leprosy was inhom-. ogenecius but very ezhogenic. Six out of seven pa- ...
doi.wiley.com/10.1002/jcu.1870140304

Journal of Computer Assisted Tomography - Fulltext: Volume 26(3 ...
US of the liver showed an inhomogeneous echo texture of the hepatic parenchyma with the presence of multiple small hyperechoic nodules (Fig. 2A). ...
www.jcat.org/pt/re/jcat/fulltext.00004728-200205000-00021.h...

Journal of Clinical Gastroenterology - Fulltext: Journal of ...
A: Irregular echo texture of the hepatic parenchyma demonstrating patchy hyperechogenicity is detected at the age of 14 years. The patient has no clinical ...
www.jcge.com/pt/re/jclngastro/fulltext.00004836-200104000-0...


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Note added at 11 hrs (2007-07-05 12:51:32 GMT)
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About the plural of "focus", both forms (focuses and foci) exist, according to Webster's:

focus (fokes) pl. focuses or foci (-s)
n.
1 the point where rays of light, heat, etc. or waves of sound come together, or from which they spread or seem to spread; specif., the point where rays of light reflected by a mirror or refracted by a lens meet (called real focus) or the point where they would meet if prolonged backward through the lens or mirror (called virtual focus)
2 focal length
3 an adjustment of the focal length to make a clear image [to bring a camera into focus]
4 any center of activity, attention, etc.
5 a part of the body where a disease process, as an infection, tumor, etc., is localized or most active
6 the starting point of an earthquake
7 Math. a) either of the two fixed points used in determining an ellipse b) any analogous point for a parabola or hyperbola (see eccentricity, sense 3)
vt.
-cused or -cussed, -cusing or -cussing
1 to bring into focus
2 to adjust the focal length of (the eye, a lens, etc.) in order to produce a clear image
3 to fix or settle on one thing; concentrate [to focus one's attention on a question]
vi.
1 to meet at a focus
2 to adjust one's eye or a lens so as to make a clear image
in focus
clear; distinct; sharply defined
out of focus
indistinct; blurred; not sharply defined
focuser
n.

Etymology
[ModL, adopted in math. senses by Johannes Kepler (1604) < L, fireplace, hearth < ? IE base *bhok-, to flame, burn > ? Arm boc, flame]

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