Left abdominal flexion is one of the clinical manifestations of splenic trauma, so how is left abdominal flexion diagnosed? Most splenic ruptures are fractured along the edge of the splenic segment, with the lower level of the spleen being the most common. This is because the lower level of the spleen is less protected by the rib arch, and the spleen is fragile and vulnerable to injury. Most splenic injuries do not involve the major large blood vessels in the splenic hilum, and if the rupture wound is directed along the splenic segment, there is rarely a rupture of the blood vessels of the splenic segment and the bleeding is slow and of short duration. If the rupture crosses the splenic segment, the vascular damage is more severe, bleeding is heavy and of long duration. If the damage involves the splenic hilum and splenic hilum, there is massive bleeding in a short period of time, with life-threatening hemorrhagic shock. The normal spleen is not easily injured under the protection of the left quadrant of the rib cage, but it is still the most vulnerable organ in the abdomen to rupture under strong shock. If the spleen is large and diseased, especially if a large congested spleen is exposed under the quarter ribs, it is more likely to rupture. Blunt abdominal contusions and severe falls and bruises are the most common causes of splenic rupture. It often coexists with liver rupture. There is tenderness on palpation and turbid percussion in the left upper abdomen. If the abdominal puncture is hemoperitoneum, the diagnosis is basically confirmed. If the child is mobile, B-ultrasound can show the shape of the spleen and the fissure, and can estimate the amount of bleeding and the presence of hematoma formation, which is an important diagnostic method before surgery if necessary. The blood picture is essentially normal in the early stages, with significant anemia seen after more than 10 hours. B-mode ultrasound This is a non-invasive test that is more commonly used to show a fragmented spleen, a large subperitoneal hematoma, and intra-abdominal blood accumulation. CT examination It clearly shows the morphology of the spleen and is highly accurate in diagnosing parenchymal laceration or subperitoneal hematoma of the spleen. Nuclear scan Techniques such as 99mTc colloidal sulfur scan or γ-photography can be used to diagnose splenic injury with safe methods. Selective abdominal arteriography This is an invasive test, which is more complicated and has some risk. However, it is quite accurate in diagnosing splenic rupture and can show the site of damaged arteries and parenchyma of the spleen. It is only used for closed injuries that are stable and not clearly diagnosed by other methods. It should be emphasized that splenic rupture is often combined with other organ injuries, such as liver, kidney, pancreas, stomach and intestine, and should not be missed in the diagnosis and management.