Diagnostic ultrasound ( PDFDrive )

A B C
D E F
G H I
FIG. 8.23 Inlammatory Masses in Crohn Disease. Top row, Phlegmons (P). (A) Loop of thick sigmoid colon is seen in cross section. Adjacent
to the margin is a poorly deined, hypoechoic zone within extensive inlamed fat. (B) Transverse sonogram in the right lower quadrant shows a thick
terminal ileum supericially. Within the extensive inlamed fat is a poorly deined, hypoechoic zone representing the phlegmon. (C) Conirmatory CT
scan. Middle row, Inlammatory masses, with air but no drainable pus. (D) Transverse image of the right lower quadrant shows abundant inlamed
fat. Centrally, there is a small luid collection or abscess (A) with small, echogenic shadowing foci (arrows) caused by air bubbles. (E) Cross-sectional
sonogram through the terminal ileum shows gut thickening, echogenic inlamed fat, and a poorly deined, focal hypoechoic area deep to the gut.
Bubbles of gas outside the gut are seen as bright, echogenic foci (arrow) on sonography. (F) Conirmatory CT scan. Bottom row, Drainable abscesses.
(G) Large, interloop luid collection. (H) Sonogram and (I) conirmatory CT scan show a supericial luid collection with small gas bubbles in the
anterior abdominal wall. (B, E, F, H, and I with permission from Sarrazin J, Wilson SR. Manifestations of Crohn disease at US. Radiographics.
1996;16[3]:499-520. 21 )
A
B
FIG. 8.24 Inlammatory Masses on Sonography. (A) Classic phlegmon with no drainable pus. The mass is hypoechoic and interdigtitates
with the surrounding inlammatory fat. There are bright foci of extraluminal air within. (B) Classic abscess—a well-deined mass with uniform
low-level echoes within related to the presence of pus.