A male preterm infant, first-born of twins delivered by cesarean section at 31 weeks’ gestation. Birth weight was 1720 g and APGAR scores were 5 and 8 at 1 and 5 min, respectively. The initial clinical course of the infant was unremarkable except mild respiratory distress which required supplemental oxygen. Enteral feeding with breast milk was started at 16 hours of age and increased with amounts of 20 ml/kg/day over the next days. On day 5 of life, clinical deterioration occurred with fecaloid vomiting, abdominal distention and bloody stools. Serum C-reactive protein and interleukin-6 levels were 37, 8 mg/L and 482, 1 pg/mL, respectively. Throm-bocytopenia [118×10  L] was detected. White blood cell count and immature-to-total ratio of the blood count remained normal. What is your diagnosis of the infant whose abdominal graph is shown below?