The spleen is the most common intraabdominal organ injured in blunt trauma. Although physical signs and symptoms, coupled with abdominal paracntesis & peritoneal lavage confirm intraabdominal injury, but isolated splenic injury especially delayed rupture, the diagnosis and clinical courseis variagble. We are reevaluation of plain roentagenologic findings for the ligth of early diagnosis of isolated splenic injury. 24 patients of theartopsy and surgically proven isolated splenic injury at Chosun University Hospital in the period from 1980 January to 1986 June were anlyzed plain roentgenogram retrospectively. The results were as follows : 1. Male patients predominate, constitution 87.5%. incidence has been greatest in second to fourth decade. 2. Mode of trauma causing isolated splenic injury is most common in motor vehicle accident and others are fall down, struck by fist, blow to object, uncertain blunt trauma. 3. Delayed rupture of spleen occured in 2 cases(8.3%). 4. Common pa terns of splenic injury is simple laceration that involves both the capsule and the parenchyma and a laceration that involves the splenic pedicle. 5. Plain chest roentgenographic findings were abnormal in 4 cases (16.7%), The most common plain abdominal roentgenographic findings was the evidence of intaabdominal fluid in 21 cases(87.5%). The other are included in order of frequency : gastric dilatation, prominent mucosal folds on greater curvature of the stomach, evidence of ;pelvic fluid, displacement of stomach to the right or downward, mass density in the region of spleen. 6. No relationship can be shown between patterns of injury, time lapse after trauma and plain roentgenological findings. But the evidence of intaabdominal fluid is most important in the light of early diagnosis. 7. Diagnosis of splenic injury may be most helpful that in combination with clinical history, clinical symptoms & signs and plain film findings, In delayed rupture, diagnostic value of serial examinaltio and surgical observation is emphasized.