Testicular adnexal torsion refers to the torsion of the adnexa of the testis, which can manifest as redness, swelling and pain in the scrotum, and can usually be cured by conservative or surgical treatment only. Testicular adnexa are remnants of embryonic mesonephric ducts or paramedian mesonephric ducts without physiological function. According to their location, they can be divided into four types: testicular adnexa (located in the upper pole of testis), epididymal adnexa (located in the head of epididymis), spermatic cord adnexa (located in distal end of spermatic cord), and vasovaginal adnexa (located in the body of the epididymis and the tail of the epididymis), which are collectively referred to as “testicular adnexa”. The four types of testicular adnexa are collectively referred to as “testicular adnexa”. Testicular adnexal torsion is common in the first two types, especially in the testicular adnexa, and occurs most often in children and adolescents before the age of 18. Testicular adnexal torsion is most often caused by trauma, strenuous exercise, etc. It may also be related to malformations or lesions of the testicular spermatic cord itself. It is recommended that patients with suspected torsion of testicular adnexa should consult the doctor in time, and if necessary, undergo ultrasound and other imaging examinations as well as surgical exploration, etc., and follow the doctor’s instructions for treatment.