Abstract:Objective To analyze the MRI performance of acute closed penile injury and to discuss the clinical value of MRI in penile injury. Methods The clinical data and MRI data of 12 patients with blunt penile injury undergoing plain MRI admitted to hospital from January 2015 to December 2019 were analyzed retrospectively. Results In 2 cases of simple penile subcutaneous hematoma,MRI showed that the penile cortex swelling,different ranges of subcutaneous hematoma were isointensity or slightly hyperintensity on T1WI,while hyperintensity on T2WI.Eight cases of traumatic rupture of the corpus cavernosum and albuginea(penile fracture),of which 1 complicated with urethral corpus cavernous slight damage. MRI showed interruption of hypointensity of tunica albuginea continuity,hyperintense signal of different lengths could be seen between fissures,which were clearly displayed by T2WI and T2-FS (T2 fat pressure sequence);hematoma of different degrees could be seen in corpus cavernous of penis,T1WI was mainly isointense,T2WI and T2-FS was mainly mixed iso-hyperintense,hypointense area could be seen in part;hematoma with different range could be seen under Buck fascia.Rupture of corpus cavernous and albuginea combined with rupture of Buck fascia was found in 2 cases.MRI showed not only the interruption of tunica albuginea and Buck fascia,as well as hematoma in corpus cavernous and subfascia of Buck,but also extensive edema or hematoma signal along the subcutaneous superficial fascia,reaching the scrotum,perineum and soft tissue around pubic symphysis. Compared with the results of clinical operation,the diagnostic localization and qualitative accuracy of MRI in this group were all 100%. Conclusion MRI can clearly show the location and extent of the closed injury of penis,and provide accurate basis for clinical treatment.