Acute abdomen no. 2

A 50 year old woman complained of diarrhoea for 5 months.
She had lost approximately 9 kilograms in weight.
Ten years ago she underwent an ovariectomy for borderline malignancy.

Scroll through the images
Before jumping to a conclusion, first try to decide which bowel is dilated.
Then try to find the exact level and cause of obstruction.

Which bowel is dilated?