Of 450 undescended testes, 13 (2.9%) were vanished. Eight were left sided and five were right sided. Six cases were in the scrotum and seven were intracanalicular or abdominal. Histopathology of the nubbin confirmed the diagnosis of vanished testes in 12 cases. The remaining patient was diagnosed by laparoscopy.
Two patients with previously normal testes had PTT at 3 and 5 weeks of age. Patients were generally sick with an elevated, enlarged tender testis and discolored edematous overlying skin. Immediate bilateral scrotal exploration and fixation was performed without radiological investigations. Both patients had normal testes at 2 and 4 years, respectively.
Of 450 patients with UDT, 13 patients (2.9%) underwent emergency surgery because of acute torsion of the UDT in the inguinal canal. Interestingly, this incidence is equal to that of the vanished testes. All patients had presented for the first time. Eleven patients had a history of empty hemiscrotum since birth. There was a time delay from 10 to 36 h. Most patients (11) presented between 5 weeks and 6 months (mean age 2 months). Ten cases were left sided and three were right sided. Generally, all patients were sick, with typical local signs of acute testicular torsion. Incarcerated inguinal hernia with the UDT was the main differential diagnosis. Manual reduction, detorsion, and radiological investigations were not performed. Immediate exploration through an inguinal incision was carried out. Contralateral fixation was performed only for patients who were younger than 6 weeks of age. All affected testes were found in the inguinal canal with extravaginal torsion (Fig. 3). Ten testes were frankly gangrenous and required orchiectomy. Three cases were of doubtful viability and had orchiopexy, but atrophy occurred in all of them subsequently. To date, unfixed contralateral testes are normal after 1–9 years of follow-up.
The frequency of testicular torsion is considered to be bimodal, with one peak in the perinatal period and another at puberty 3. Perinatal testicular torsion is a better term than neonatal torsion because torsion can occur prenatally and well beyond the age of 30 days 1. Djahangirian et al. 4 have reported cases of neonatal torsion up to 6 months of age. Most cases of torsion of the UDT occur before 6 months of age 2. In this study, 85% of cases of TUDT occurred between 5 weeks and 6 months (a mean of 2 months). It is, therefore, logical to include cases of TUDT in those of PTT. It is claimed that IUTT is more common than PTT (72–81 vs. 28–19%, respectively) 1,5. This may not be true if we include TUDT in the postnatal period and vanished testes in the prenatal period. In this study, we had 13 cases of vanished testes and seven cases presenting with a mass at birth (a total of 20 cases with prenatal torsion). Postnatally, we had two cases with acute torsion of previously normal testes and 13 cases of TUDT (total of 15 cases). The precise incidence would be 57% for prenatal versus 43% for PTT.
Perinatal testicular torsion including that of the UDT is extravaginal 2,5. The spermatic cord twists two to four times outside the tunica vaginalis. Complicated pregnancies and vaginal deliveries may predispose to IUTT 5. Torsion occurs because of hypermobility and elasticity of the testicular tissue, which will only be fixed in the scrotum during the first several days of life 6. It takes several weeks to be securely attached in the scrotum 7,8. The UDT will never be fixed to the scrotum and will remain hypermobile and susceptible to torsion as long as it is not fixed surgically in the scrotum 2.
A new classification has been proposed. Perinatal testicular torsion includes IUTT (including vanished testes) and PTT (torsion of previously normal testes as well as UDT). This classification is based on the time of presentation to determine the potential for testicular salvage. Antenatal ultrasonography is not sensitive for the detection of cases of vanished testes and those presenting with testicular mass at birth 9–11.
A vanished testis can be found in the scrotum (torsion of a normally descended testis), intracanalicular or abdominal (torsion of UDT). This is usually established by exploration and histopathological examination of the nubbin. In this study, 13 patients of 450 patients with UDT had unilateral vanished testes (2.9%). Six were scrotal in position and seven were intracanalicular or abdominal. None of these patients was subjected to contralateral orchiopexy, which is well accepted in the literature 10.
IUTT presenting with a mass at birth is marked by minimal to no discomfort and highly localized findings. The affected testis is large, firm, and not tender. The affected hemiscrotum may be discolored, with no systemic symptoms or signs 1. The diagnosis is confirmed by ultrasonography. The testis is heterogenous with a hypoechoic necrotic center and a hyperechoic thickened tunica albuginia with an associated reactive hydrocele 12. Doppler enhancement shows disordered blood flow. Preoperative ultrasonography showing a heterogenous testis is universally predictive of organ loss and requires no emergent exploration. However, isogenicity with altered blood flow requires emergent operation 13. In this study, the authors did not encounter this situation because emergent surgery without radiological investigations was performed under acute conditions. It is important to compare both sides as contralateral IUTT may not be evident clinically 14. It may be difficult to exclude malignancy especially if the patient is not a neonate. Clinical and ultrasonographic distinction is difficult and exploration may be mandatory 1.
A few cases of IUTT are acute surgical emergencies if torsion occurs just before, during, or soon after delivery. There are acute local signs and Doppler ultrasonography, if done, shows isogenicity of the testis with altered blood flow 13,15. There is an increasing trend for conservative management with gain of experience in nonacute cases and if the diagnosis is confirmed by Doppler ultrasonography 16. The aim is to avoid the risks of anesthesia and operative complications 4.
In contrast to IUTT, postnatal torsions require emergent surgery. A salvageable rate of 40–50% has been reported 4,17. In our study, the two cases could be saved after emergent bilateral scrotal exploration without any investigations. Bilateral scrotal exploration was performed because both patients were younger than 6 weeks of age with weak testicular attachment to the scrotum.
Torsion of an UDT presents with symptoms and signs of acute abdomen with a tender mass in the inguinal region and an empty ipsilateral hemiscrotum. Color Doppler ultrasonography has been claimed to be the best imaging modality as it can assess the anatomy as well as the blood flow to the testes 18. The authors believe that radiologic investigations in TUDT are difficult to perform because of the small size of the gonads, which lie independently in the inguinal canal. Hence, these investigations were considered unnecessary 2,17. The differential diagnosis of TUDT is mainly strangulated inguinal hernia. The differentiation between these two conditions is difficult and unnecessary. Manual reduction or detorsion plays no role. Immediate inguinal exploration of the affected testis is mandatory. Contralateral orchiopexy is performed only if the patient is 6 weeks of age or younger 2. In this study, unfixed contralateral testes remain normal after 1–9 years of follow-up. However, the outcome of the affected testis is poor 2,19.
The time of presentation may be the greatest determinant of success to salvage the testis. Our patients presented with a time delay of 10–36 h, with a salvage rate of 0%. However, TUDT, unlike cases of IUTT, remain salvageable if there is full cooperation and understanding between neonatologists, surgeons, and parents to avoid time delay and to improve the outcomes. Also, orchiopexy can be performed safely and effectively in patients as young as 2 months of age 2,20. Therefore, earlier orchiopexy at 3–6 months is advised to improve the outcomes of TUDT. However, this will not nullify the risk of loss of the gonad if torsion occurs before the recommended age.
Recently, there has been a long debate on observation versus prompt surgical exploration in cases of perinatal torsion 10,21. It was our policy in this study not to operate emergently on cases of IUTT with no acute signs. We are aware that in the literature, there are cases of IUTT who presented acutely 13,15. However, we did not encounter this problem. If there is acute pain on touching the hemiscrotum with overlying edema and erythema, immediate bilateral exploration and fixation is justified 10. In our institution, no preoperative radiological investigations are required. However, for nonacute cases, elective inguinal exploration was performed simply because radiological investigations could not exclude malignancy. In one case, we were able to rule out malignancy confidently because the testis was already showing atrophy. Retrospectively, and with counseling with the parents, we could have treated all the patients conservatively with close observation, again, to avoid anesthetic and operative risks. Medicolegal legal concerns should never drive clinical medicine 10.
The incidence of bilateral perinatal testicular torsion ranges between 5 and 22% 4,14. Some investigators, including us, believe that the incidence is on the lower side 10,22. Fortunately, we did not encounter any patient with bilateral involvement. For cases with synchronous bilateral involvement with no acute signs, urgent radiological evaluation is mandatory. Contralateral involvement may be discovered with no clinical evidence. In any case, whether synchronous or asynchronous, acute signs require immediate surgical exploration. Extravaginal torsion can occur asynchronously up to the age of 6 weeks. Parents are advised to examine the scrotum at each diaper change 10. In the present study, however, we fixed the contralateral testis if the patient presented acutely, requiring emergent surgery, and if the patient was 6 weeks of age or younger.
Cases of TUDT were included with those of PTT because 85% of them occurred between 5 weeks and 6 months. This addition altered the incidence to 57% for IUTT versus 47% for PTT. Most cases of IUTT present at birth with a nontender testicular mass. Radiological evaluation is essential. It seems that there is a significant role for conservative management if malignancy can be excluded. The authors recommend immediate exploration in all acute cases of IUTT, PTT, and TUDT, with no need for radiological investigations. The contralateral testis should be fixed if the patient is 6 weeks of age or younger. The authors recommend early orchiopexy at 3–6 months to avoid the risk of torsion. TUDT remains potentially salvageable despite the poor outcome in this study.
Conflicts of interest
There are no conflicts of interest.
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