From the question on page 33

The CT scan in fig 1 of the question shows a thickened caecum with adjacent fat streaking, but no evidence of abdominal free air or a collection. The specimen of the right colon shows perforation within a central punched out area at the lower pole of the caecum at the site of submucosal injection site (stains of methylene blue still seen) (fig 1).

Laparotomy revealed a 1.5×1.5 cm perforation …