SHIH-PING LIUSHI-WEI HUANGKAI-HSIN LINLin M.-C.JU-TON HSIEH2021-01-292021-01-2920010929-6646https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035696015&partnerID=40&md5=5e8b6abc266b9e323a3a0c58deccd735https://scholars.lib.ntu.edu.tw/handle/123456789/543904Neonatal testicular tumors are extremely rare. We report the case of a full-term male newborn with right hemiscrotal swelling found immediately after birth. The right hemiscrotal skin gradually turned dusky dark and then adhered to the hard scrotal contents. Missed right testicular torsion was suspected and emergency exploration was not attempted. Right hemiscrotal swelling became aggravated, so right orchiectomy and left orchidopexy were performed. During surgery, severe inflammation of the right testis and the right hemiscrotum were observed and diffuse hemorrhage with focal hematomas was noted within the removed right testis. Histopathology of the specimen revealed a ruptured mature cystic teratoma of the testis. The alpha-fetoprotein concentration was 729 × 104 μg/L 10 days after the operation, and dropped to 185 × 104, 25 × 104, and less than 20 × 104 μg/L 2, 5, and 8 months later, respectively. Postoperative abdominal and pelvic computerized tomography scans revealed neither lymphadenopathy nor distant metastasis. During a follow-up of 8 months, no evidence of tumor recurrence was found. Although extremely rare, testicular tumors should be included in the differential diagnosis of an enlarged hard or firm scrotal mass in the male neonate.Newborn; Spermatic cord torsion; Teratoma; Testicular neoplasm[SDGs]SDG3alpha fetoprotein; article; birth; case report; computer assisted tomography; cyst rupture; differential diagnosis; disease severity; emergency surgery; follow up; hematoma; histopathology; human; lymphadenopathy; male; metastasis; newborn; orchidopexy; orchiectomy; orchitis; pelvis; postoperative hemorrhage; postoperative period; protein blood level; scrotum; skin; testis teratoma; testis torsion; testis tumor; tumor recurrence; Diagnosis, Differential; Humans; Infant, Newborn; Male; Rupture, Spontaneous; Spermatic Cord Torsion; Teratoma; Testicular Neoplasmsjournal article118025402-s2.0-0035696015