Question
A 66-year-old man with decompensated alcoholic cirrhosis presented with
abdominal pain. He had a history of an appendectomy 23 years previously.
He underwent endoscopic injection sclerotherapy (EIS) using
N-butyl-2-cyanoacrylate (Histoacryl®) for gastric varices (GV) 1 month
previously (Figure 1). Physical examination was normal. Abdominal X-ray
revealed small intestinal gas with niveau and a 3-cm, high-density
structure in the pelvic cavity (Figure 2). What is the diagnosis and
cause?