Testicular Fine Needle Aspiration Cytology versus Open Biopsy in the Evaluation of Azoospermic Men ()
1. Introduction
Azoospermia, defined as the absence of spermatozoa in the ejaculate after assessment of centrifugated semen on at least 2 occasions, affects approximately 1% of the male population & 10% of men who seek fertility evaluation [1] .
The etiology of azoospermia may be attributed to 1) pre-testicular causes (e.g., endocrine abnormalities causing secondary testicular failure), 2) testicular causes (e.g., primary testicular failure due to intrinsic disorders of spermatogenesis within the testis, including maturation arrest, complete absence of germ cells or Sertoli cell- only syndrome), or 3) post testicular causes (e.g., ejaculatory dysfunction or ductal obstruction that prevent sperm transport) [2] .
To distinguish between obstructive & non-obstructive azoospermia testicular biopsy may be performed. Although surgical biopsy of the testis has generally been regarded as the gold standard in the evaluation of male infertility [3] , testicular fine needle aspiration (FNA) is also considered as an alternative method that has gained increasing popularity as a simple, minimally invasive procedure that can help in assessing testicular function accurately [3] -[7] . Both methods give a clear assessment of spermatogenesis and allow a rational choice for the future management of the couple by reconstructive surgery, hormonal therapy, artificial donor insemination or adoption [8] .
We had done this study to determine the causes of azoospermia and evaluate the efficacy of FNAC as compared to open testicular biopsy in evaluating azoospermic men by correlating diagnosis from testis FNAC with biopsy histology.
2. Patients and Methods
The study included 67 male patients with ages ranged from 20 to 35 years and infertility ranged from 1 to 20 years. They attended the andrology clinic at Al-Yarmouk Teaching Hospital, a tertiary hospital in Baghdad/Iraq with a total number of admissions including emergency admission of 216,000 patients per year, in the period between January 2010 and January 2014. History taking (including fertility, sexual, genitourinary, general, medical and drug history) and a complete physical examination were done for each patient with special emphasis on the genitalia (penis, testis size and consistency, epididymisconsistency, vasa differentia presence and consistency, spermatic cords and inguinal regions).
Laboratory testing including urinalysis and endocrine evaluation were performed on all patients, karyotyping to exclude chromosomal abnormalities. Scrotal ultrasound (U/S) and trans rectal ultrasound (TRUS), to evaluate the seminal vesicles and the ejaculatory ducts, were done as indicated.
Inclusion criteria were male patients with the presence of azoospermia and exclusion criteria were karyotype abnormalities and testicular volume less than 5 ml (to prevent subsequent defect in androgen synthesis)
Patients were then subjected to fine needle aspiration of the testes for cytological evaluation. A specimen for histopathological correlation was obtained from the same patients by open testicular biopsy. The work was conducted in compliance with Institutional Review Board/Human Subjects Research Committee requirements.
The procedures of the FNAC of the testes were done in the surgical outpatient. With the patient in the supine position, the scrotal skin was prepared with 5% betadine solution. 5 ml of 1% xylocaine was injected into the spermatic cord bilaterally. The testis was positioned with the epididymis directed posteriorly. The scrotal skin was stretched over the skin by wrapping the scrotal skin behind the testis with a sponge. The planned aspiration sites were marked on the scrotal skin overlying the testis. Aspiration was done with a 23 gauge fine needle attached to a 10 ml disposable syringe and using the established suction-cutting technique (in and out movements varying from 5 - 8 mm were used to aspirate the tissue), 4 to 5 excursions were made on each site of aspiration. Then suction was released and the tissue was expelled into a slide, gently smeared and fixed immediately in 95% ethyl alcohol. Routine Hematoxylin and eosin stain was performed on the smears. Bilateral open testicular biopsy was performed immediately following the procedure of FNAC of the testes. The anterior scrotal skin was stretched while the testis was lifted and biopsy samples were obtained with small curved scissors through a small scrotal incision without delivering outside the skin or tunica vaginalis to minimize post operative scarring. Hemostasis was obtained with careful use of electrocautery, and the tunica albuginea was closed with fine, absorpable suture as were the layers of the scrotum. The testicular biopsy specimens were immediately placed into freshly prepared Bouins solution (a fixative that does not destroy the testicular architecture) and studied histopathologically both to demonstrate the pattern of sperm production and to rule out underlying testicular pathology such as intratesticular germ cell neoplasia. The results were statistically analysed by using IBM SPSS computer program.
3. Results
A total of 67 patients were included in this study. Three men out of the total had unilateral testis. The mean age of the patients studied was 28 years and the mean duration of infertility was 6 years. The clinical characteristics of the patients are shown in (Table 1).
Associated urogenital diseases were detected in 31 (46.2%) patients and varicocele was the most common finding in them (22.3%) (Table 2).
A total of 131 (FNAC) smears and biopsy specimens obtained from 67 men were studied (3 men had single testis). The following were the morphological diagnosis (Figures 1-7):
1) Normal spermatogenesis 12 (17.9%) revealed all germ cell maturation steps from speramatogonia till mature spermatozoa.
2) Hypospermatogenesis (germ cell hypoplasia) 4 (5.9%), the smears had less than normal amount of spermatozoa admixed with other cells.
3) Maturation arrest 39 (58.2%), showed no spermatozoa with presence of immature germ cells, including several primary spermatocytes and spermatids.
4) Sertoli cell only syndrome (germ cell aplasia) 7 (10.4%), the smears were cellular characterized by complete lack of germ cells and showed only Sertoli cells.
5) No spermatogenesis (complete tubular hyalinization) 5 (7.4%) (Table 3).
Spermatogenic arrest at the primary spermatocyte or spermatid level presented the most frequently encountered pattern (58.2%). Most of the patients with non obstructive azoospermia (81.9%) had small size testis with elevated S.FSH level and those with maturation arrest appeared to have arrested spermatogenesis at the primary spermatocyte stage.
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Table 1. The clinical characteristics of the patients with azoospermia.
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Table 2. The urogenital diseases found in our patients.
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Figure 1. Fibrosis of testes (open testicular biopsy), H&E, 40×.
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Figure 2. Sertoli Cell Only Syndrome (SCOS) or Germ cell aplasia (open testicular biopsy), H&E, 100×.
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Figure 3. Spermatogenesis arrest (open testicular biopsy), H&E, 100×.
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Figure 4. Normal spermatogenesis (open testicular biopsy), H&E, 100×.
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Figure 5. Spermatids & mature spermatozoa (FNAC), (H&E, 400×).
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Figure 6. Spermatocytes & mature spermatozoa (FNAC), (H&E, 400×).
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Figure 7. Sertoli cells & Spermatocytes (FNAC), (H&E, 400×).
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Table 3. The different morphological patterns encountered in the patients.
In our study a good correlation was found in 120 (91.6%) testes between the cytological findings and the results of open biopsy. The correlation was identical in the right and left testis, p value was statistically insignificant (p > 0.05). In 8 cases (6.1%) the smears were scanty and insufficient for diagnosis. In 6 out of the 8 cases the corresponding histopathological diagnosis was complete tubular hyalinization. The other 2 showed a histopathology of normal spermatogenesis. Discordant findings were reported in 3 cases (2.3%) where spermatogenic arrest was recognized in samples obtained by FNA and hypospermatogenesis was demonstrated in samples obtained by open surgical biopsy.
Of the 15 patients with varicocele 8 (53.3%) of them proved to have normal spermatogenesis in both cytological and histopathological studies. The remaining 7 (46.7%) patients had abnormalities in their testes. Those included hypospermatogenesis in 4 patients (26.7%), spermatogenic arrest in 2 (13.3%) and Sertoli cell only syndrome in 1 patient (6.7%).
4. Discussion
Azoospermia is present in about 10% - 15% of men evaluated for infertility and represents the final result of different testicular alterations, ranging from normal spermatogenesis with seminal tract obstruction or absence of vas deference (obstructive azoospermia) to different problems of the spermatogenic process including hypospermatogenesis, maturation arrest and complete absence of germ cells or Sertoli cell only syndrome (non obstructiveazoospermia) [9] -[11] .
In our study we had found that most of the patients with maturation arrest and elevated S.FSH level had their arrest at the primary spermatocyte stage. This is similar to the results reported by some studies (Amer et al. [12] , Schulze et al. [13] , Seo and Ko [14] and Tsujimura et al. [15] ) which studied that S.FSH was elevated in those cases of azoospermia where spermatogenesis was arrested prior to spermatid differentiation. This arrest might be caused by genetics or by secondary influences such as antibiotics, heat or general diseases.
In the present study, obstructive azoospermia (normal testicular volumes, S.FSH with normal histology) represented (17.9%) of cases. Similar studies recorded by Rashed et al. [16] (24%), Wong et al. [17] (25%) and Colgan et al. [18] (20%). Brannen and Roth [19] reported a higher incidence of obstructive azoospermia (35%), the same was reported by Al-Rayess et al. [20] (31%). Thomas j [21] reported an incidence (38%) for obstructive azoospermia. But on the other side there were studies that reported low incidence, Meinhard et al. [22] reported (5%) for obstructive azoospermia, also Hddad et al. [23] , a study at Jordan reported (11.2%) for obstructive azospermia, (Table 4). The variation in the incidence reported in these studies could be related to a combination of social habits, environmental conditions and genetics.
The accuracy of FNAC was determined by comparing the FNAC findings with that of the histological findings obtained from an open surgical biopsy, which is taken as the gold standard for the diagnosis. In our study there was a good agreement between the cytological and histological diagnosis. An accuracy of (91.6%) was achieved. A comparison with other studies is shown in (Table 5) [24] .
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Table 4. Comparison of obstructive azoospermia percentage with other studies reported in the literature.
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Table 5. Literaturethat correlates testicular FNA cytology to biopsy histology.
In 3 testicular aspirates diagnosed as hypospermatogenesis by histopatholopgy, fine needle aspiration smears diagnosed them as maturation arrest. In 8 cases in our study, the material aspirated was scanty and insufficient for diagnosis. The corresponding histopathological diagnoses were a majority of 6 cases with complete tubular hyalinization. The other 2 cases showed a histopathology of normal spermatogenesis. These insufficient aspirates were mostly because of the relatively a cellular, fibrosed, atrophied testes.
In diagnosing obstructive azoospermia (normal spermatogenesis) which is considered a correctable posttesticular cause for infertility, the accuracy of FNAC compared to histopathology was 100%.
5. Conclusions
1) Testis FNA cytology correlates well with testis biopsy histology in the evaluation of male infertility.
2) Testicular FNA cytology is a simple and minimally invasive procedure that can diagnose accurately testicular histology differentiating obstructive from non obstructive azoospermia and helping in performing sperm extraction for artificial reproductive techniques.