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1. Epiploic appendagitis

Figure 38-1

Epiploic appendagitis.

Unenhanced CT of a 14-year-old child with acute abdominal pain demonstrates an ill-defined soft tissue mass adjacent to the right colon. There is a peripheral rim (arrow), representing the thickened serosa. Adjacent fat is thickened and edematous.

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2. Mesenteric adenitis

Figure 38-2

Mesenteric adenitis.

A transverse sonographic image of the right lower quadrant of a 6-year-old child with abdominal pain shows multiple moderately enlarged lymph nodes (arrows). The nodes measured up to 1.8 cm in diameter.

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3. Lymphatic malformation (lymphangioma)

Figure 38-3

Lymphatic malformation (lymphangioma).

Contrast-enhanced CT shows a septated low-attenuation abdominal mass that displaces contrast-opacified bowel to the left.

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4. Desmoid tumor

Figure 38-4

Desmoid tumor.

A, B. Axial and coronal contrast-enhanced CT images of an 18-year-old patient with Gardner syndrome show a large lower abdominal-pelvic soft tissue mass (arrows). Despite the large size, the margins are well defined. There is only slight heterogeneity of enhancement, and no evidence of calcification, necrosis, or hemorrhage.

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5. Desmoplastic small round-cell tumor

Figure 38-5

Desmoplastic small round-cell tumor.

A. A contrast-enhanced CT image of a 12-year-old boy shows a lobulated intraperitoneal mass (arrow). B. CT examination 4 years after surgical resection demonstrates recurrent tumor (arrow) in the subhepatic region. There is invasion of the adjacent portion of the liver. C. An intraperitoneal tumor deposit (arrow) is also present in the pelvis.

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