This document contains radiological images showing various acute abdominal conditions: 1) Ultrasound images show mesenteric lymphadenitis causing ileocolic intussusception in a child, seen as enlarged lymph nodes and the classic "doughnut sign". 2) CT scans of a elderly woman show multiple small bowel intussceptions caused by metastatic lung cancer, seen as bowel wall thickening and enteroenteric invaginations. 3) CT images demonstrate an enteroenteric intussusception without obstruction in the small bowel.

1. DR/ABDALLAHNAZEER.MD.
Radiological imaging of acute abdomen.

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.

53. Portal venous gas due to small bowel infarction.

66. Sigmoid volvulus.

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.

73. Toxic megacolon secondary to Clostridium infection.

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.

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.

85. CT images for acute appendicitis.

86. CT images for acute appendicitis.

88. Acute calcular cholecystitis.

95. X-Ray and US with air/fluid level below the right diaphragm in subphrenic abscess

96. CT images for subphrenic abscess.

105. Left ureteric stone with hydronephrosis.

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.

112. Calcified abdominal aortic aneurysm.

115. Thank You.