48. ileocolic intussusception caused by mesenteric lymphadenitis. a. Transverse ultrasonography
shows several enlarged mesenteric lymph nodes (arrowheads). b. Transverse ultrasonography
shows the classic “doughnut sign” of the concentric rings of intussusception (arrow). c-e. Venous
phase of CT scan axial (c, d) and coronal (e) scans show a target lesion in the right lower
abdomen with inner intussusceptum (open arrows) and outer intussuscipiens (arrows). f, g. Air
reduction shows a soft tissue mass (arrows) representing an intussusception.
49. Intussusception in a 69-year-old woman with partial small bowel obstruction caused
by metastatic lung cancer. a-f. Venous phase of axial CT scans show multiple small
bowel wall thickening and enteroenteric intussusceptions (arrows). Small bowel wall
thickening represents metastasis of adenocarcinoma of lung cancer.
50. a-c. Axial CT scans show classic CT appearance of enteroenteric (jejunojejunal)
intussusception (arrows). There is no evidence of obstruction, although small
bowel was minimally dilated. d. Coronal reformatted CT scan shows
invagination (arrows) of bowel and mesenteric vessels.
72. Plain abdominal
radiograph of
toxic megacolon
that shows
distention of the
transverse colon
associated with
mucosal edema.
The maximum
transverse
diameter of the
transverse colon
is 7.5 cm.
76. Ischemic colitis with accordion sign-alternating edematous haustral folds separated by transverse
mucosal ridges filled with oral contrast material simulating the appearance of accordion.
77.
78.
79. Pseudomembranous colitis. (Left) Axial CT scan of the midabdomen utilizing oral but not
intravenous contrast demonstrates marked thickening of the colonic wall (white arrows)
producing the so-called "accordion sign." There is a small amount of pericolonic stranding
(red arrow) and ascites (green arrow). (Right) Axial CT scan through the pelvis shows
marked thickening of the wall of the rectum (yellow arrows) indicating this is a pan-colitis.
109. Advanced stages of salpingitis. a and b) Transvaginal US shows Elongated and dilated
fallopian tube with echogenic contents (“string sign”)c and d) Contrast-enhanced CT
scan shows dilated fallopian tube with wall thickening and enhancement
110. Coronal and axial CT imaged shows pelvic fluid collections with wall enhancement
(abdominal abscess). c) Axial CT image shows pelvic fluid collection with gas bubbles.