A 78-year-old male who is known to have ischaemic heart
disease is admitted with a history of severe sudden onset abdominal pain,
which woke him up, from his sleep. This was followed by diarrhoea, which later
became bloody. On examination of the patientís abdomen there was mild
peritonism. Plain x-ray of the abdomen showed thumb printing and a dilated
Which of the following areas of the colon is most likely
to be affected by this condition?