Line 9:11·Radiopaedia prefers the non-possessive eponym: 'Ogilvie's syndrome'.
Oxford Comma
suggestion
"Nontoxic megacolon contrasts with toxic megacolon, an acute complication accompanied by mural abnormalities such as thickening, loss of haustral folds, pneumatosis or free gas."
Line 16:156·Use the Oxford comma in 'folds, pneumatosis or free'.