PMC4899936_01
21-year-old man with inflammatory pseudotumor of the colon. Ultrasound of the abdomen with color doppler at the level of right upper quadrant demonstrates heterogeneous, complex, multiseptated, predominantly cystic mass with solid hyperechoic component revealing increased vascularity (arrow).
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Transabdominal ultrasound revealed a complex heterogeneous mass in the right abdomen in close relation to the ascending and descending colon (Fig. 1).
21-year-old man with inflammatory pseudotumor of the colon. Contrast-enhanced CT axial (A) and coronal (B) reformatted images of the upper abdomen demonstrate complex, multiseptated, predominantly cystic mass in the right upper and mid abdomen (white arrows). The mass closely abuts the right colon (black arrows).
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CT, the mass was hypoattenuating, and no calcification was evident. Contrast-enhanced CT demonstrated a complex, multiseptated cystic mass lesion with enhancing septations occupying most of the right upper and mid abdomen, in close apposition to the ascending colon and hepatic flexure (Fig. 2).
21-year-old man with inflammatory pseudotumor of the colon. Surgically resected specimen reveals a 9.5-cm, multiloculated, cystic mass adherent to the wall of right colon. Internal contents varied from tan serous fluid to pasty dark-brown material. Note relationship with the adjacent colon (C).
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Pathologically, gross inspection of the specimen revealed a 14.5-cm lobulated mass, purple to tan in color (Fig. 3).
21-year-old man with inflammatory pseudotumor of the colon. Haematoxylin-eosin stain with magnification of 40 x demonstrates myofibroblastic spindle-cell proliferation mixed with inflammatory cell infiltrate.
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Microscopically, the tumor showed pseudocystic cavities with signs of recent and remote hemorrhage (Fig. 4).