PMC5480006_01
White arrows point to the right colon mass (A) and periaortic gas (B) seen on computed tomography scan
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F1
Computed tomography (CT) of the abdomen and pelvis confirmed infrarenal aortitis and a right colon mass (Fig. 1A, B).
Right colon mass (A) and rectal mass (B) on colonoscopy
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F2
Colonoscopy revealed a 2-cm mass in the proximal ascending colon (Fig. 2A), as well as a 5-cm rectal mass (Fig. 2B).
Histology of right colon mass (A) and rectal mass (B)
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F3
The right colon mass was an adenocarcinoma (Fig. 3A) (T3N0), negative for deficient mismatch repair protein expression, B-RAF (B-type rapidly accelerated fibrosarcoma) and K-RAS (Kirsten rat sarcoma oncogene) mutation but positive for N-RAS (neuroblastoma RAS oncogene). Tumor-free margins were achieved (Fig. 3B).