Complicated midgut volvulus is a surgical emergency with high mortality rate if not treated promptly. Most of midgut volvulus in adults is a silent form of congenital midgut malrotation, but it also can be acquired from other medical conditions, such as adhesion bands, tumors, and mesenteric cysts. Posttraumatic mesenteric pseudocysts are rare entities, and the diagnosis tends to be delayed. In reviewing the medical literature, midgut volvulus as a delayed consequence of posttraumatic hemorrhagic mesenteric pseudocyst has never been reported before. Here, we report a 50-year-old female patient who had experienced blunt abdominal injury 3 months earlier and midgut volvulus that resulted from a delayed posttraumatic hemorrhagic pseudocyst. The patient was successfully treated with surgical intervention.