Pneumatosis intestinalis is pathognomonic for

.(E). Pneumatosis intestinalis can be seen in various other conditions, including Hirschsprung's disease, pseudomembranous enterocolitis, neonatal ulcerative colitis, and ischemic bowel disease. However, it is a characteristic finding in 85% of patients with NEC. Dark, concentric rings within the bowel wall represent hydrogen as a byproduct of bacterial metabolism