|Year : 2017 | Volume
| Issue : 4 | Page : 425-436
Genital tuberculosis in females
G Angeline Grace, D Bella Devaleenal, Mohan Natrajan
Department of Clinical Research, ICMR-National Institute for Research in Tuberculosis, Chennai, India
|Date of Submission||29-Sep-2015|
|Date of Web Publication||28-Aug-2017|
Department of Clinical Research, ICMR- National Institute for Research in Tuberculosis No. 1, Mayor Sathyamoorthy Road, Chetpet, Chennai 600 031, Tamil Nadu
Source of Support: None, Conflict of Interest: None
| Abstract|| |
The morbidity and mortality due to tuberculosis (TB) is high worldwide, and the burden of disease among women is significant, especially in developing countries. Mycobacterium tuberculosis bacilli reach the genital tract primarily by haematogenous spread and dissemination from foci outside the genitalia with lungs as the common primary focus. Genital TB in females is a chronic disease with low-grade symptoms. The fallopian tubes are affected in almost all cases of genital TB, and along with endometrial involvement, it causes infertility in patients. Many women present with atypical symptoms which mimic other gynaecological conditions. A combination of investigations is needed to establish the diagnosis of female genital TB (FGTB). Multidrug anti-TB treatment is the mainstay of management and surgery may be required in advanced cases. Conception rates are low among infertile women with genital TB even after multidrug therapy for TB, and the risk of complications such as ectopic pregnancy and miscarriage is high. More research is needed on the changing trends in the prevalence and on the appropriate methods for diagnosis of FGTB.
Keywords: Anti-tuberculosis treatment - conception - fallopian tubes - genital tuberculosis - infertility - laparoscopy
|How to cite this article:|
Grace G A, Devaleenal D B, Natrajan M. Genital tuberculosis in females. Indian J Med Res 2017;145:425-36
| Introduction|| |
Tuberculosis (TB) is a major public health problem worldwide despite a declining trend in mortality, with effective diagnosis and treatment. An estimated 10.4 million people developed TB in 2015 and more than half of the TB cases (60%) were seen in South-East Asia and Western Pacific Regions. About 60 per cent of TB cases and deaths occur among males, but the disease burden is high among women also. In 2015 nearly 500,000 women died from TB, and among them, 28 per cent had human immunodeficiency virus (HIV) co-infection. Genital TB in females is well recognized as an important aetiological factor for infertility in countries with high prevalence of TB. Genital TB usually occurs secondary to TB in other sites (primarily, the lungs). The spread is generally through haematogenous or lymphatic routes. Tuberculous infection of the female genital organs can result in infertility, dyspareunia, menstrual irregularities and chronic pelvic inflammatory disease (PID). Drug therapy for female genital TB (FGTB) is similar to the standard treatment regimens used for pulmonary TB. In patients with infertility, conception rate is not very encouraging after anti-TB treatment (ATT). Here we review the epidemiology, clinical presentations, recent advances in diagnosis and treatment of FGTB.
| Female Genital Tuberculosis - Epidemiology and Pathogenesis|| |
Genitourinary TB is a common form of extrapulmonary TB (EPTB) worldwide (27%) with genital TB alone accounting for 9 per cent of all EPTB cases. However, the burden of genital TB in females is underestimated as most of the patients are asymptomatic and usually diagnosed during evaluation for infertility. A study on FGTB among patients with infertility from India has shown an incidence of 3-16 per cent. Higher rates have been reported from tertiary referral hospitals in India probably due to referrals from different parts of the country for the diagnosis and management of difficult and complicated cases. A study among women with infertility registered for in vitro fertilization in north India reported the prevalence of genital TB in patients with tubal factor infertility as 48.5 per cent. A survey by the Indian Council of Medical Research (ICMR) reported that prevalence of FGTB in India has increased from 19 per cent in 2011 to 30 per cent in 2015. A multicentric ICMR study team is working on developing a nationally applicable algorithm for diagnosis and management of FGTB. The existing literature on the prevalence of genital TB among women with infertility and conception rates (spontaneous or assisted) is shown in [Table 1],,,,,,.
|Table 1: Studies on the prevalence of genital tuberculosis among women with infertility reported in the literature|
Click here to view
Genital TB is mostly secondary to pulmonary TB or extrapulmonary foci such as kidneys, meninges, skeletal system and gastrointestinal system. TB bacilli infect the genital tract by four routes - haematogenous route (with lungs as the common primary focus), descending direct spread, lymphatic spread and rarely as primary infection of the genitalia through sexual transmission. The genital organs affected by Mycobacterium tuberculosis (in descending order of frequency) are as follows: fallopian tubes (95-100%), uterine endometrium (50-60%), ovaries (20-30%), cervix (5-15%), uterine myometrium (2.5%) and vagina/vulva (1%).
The morphology of genital organs infected with TB varies widely. The organs appear normal in the early stages. The ampullary region of the fallopian tubes shows the earliest changes and the fimbrial processes become swollen later. TB endometritis is often focal, and pathological changes such as ulceration, caseous necrosis and haemorrhage are seen in advanced endometrial TB. In later stages, adhesions may occur between ovaries and adjacent pelvic organs resulting in adnexal mass. Intrauterine adhesions if occur can result in partial obliteration of the uterine cavity. Cervix, vulva and vagina are rarely affected,.
| Clinical Presentations of Female Genital Tuberculosis|| |
M. tuberculosis affects the female genital organs, especially the fallopian tubes, and thereby causes infertility. It can occur in any age group, but women in the reproductive age group (15-45 yr) are the most affected. In most cases, the disease is asymptomatic or can present with a few symptoms among which infertility is the most common. Other symptoms reported are menstrual irregularities such as oligomenorrhoea, hypomenorrhoea, amenorrhoea, menorrhagia, dysmenorrhoea, metrorrhagia, pelvic pain and abnormal vaginal discharge. In postmenopausal women, genital TB presents with symptoms resembling endometrial malignancy, such as postmenopausal bleeding, persistent leucorrhoea and pyometra. Genital TB can mimic or coexist with other gynaecological and abdominal pathologies such as genital carcinomas, acute appendicitis, ovarian cysts, PID, or ectopic pregnancy. Varied clinical presentations of FGTB are shown in [Table 2],,,,,,,,,.
|Table 2: Varied clinical presentations of genital tuberculosis in females reported in the literature|
Click here to view
| Diagnosis of Female Genital Tuberculosis|| |
The discovery of tubercle bacilli in 1882 and isolation of the bacilli in samples of urine and sputum in 1883 contributed immensely to the diagnosis and management of TB. Despite availability of various diagnostic techniques, diagnostic dilemma still exists, especially for genital TB. Hence, FGTB needs a thorough systematic clinical examination with high degree of suspicion and use of intensive investigations. The possibility of FGTB should be considered in patients with chronic PID not responding to standard antibiotic treatment, unexplained infertility or in women with irregular menstrual cycle or postmenopausal bleeding and persistent vaginal discharge (where genital neoplasias have been excluded). Risk factors include contact with a smear-positive pulmonary TB patient, past history of TB infection, residence in or recent travel to endemic areas, low socio-economic background, people living with HIV and drug abuse. There is no single diagnostic test available to confirm the diagnosis of FGTB. High degree of clinical suspicion, elaborate history taking, systemic examination, battery of tests to document M. tuberculosis as well as imaging methodologies for characteristic structural changes are essential for the diagnosis.
| Investigations|| |
As per the WHO definition of EPTB, diagnosis of EPTB should be made on the basis of 'one culture-positive specimen, or positive histology or strong clinical evidence consistent with active EPTB'. A general examination to exclude a TB focus elsewhere in the body, X-ray chest, tuberculin skin test (TST), erythrocyte sedimentation rate (ESR) and complete blood count should be done at baseline. It has been reported that 10 to 75 per cent of patients with genital TB may have abnormal X-ray,,. However, a negative chest X-ray does not rule out the possibility of genital TB. TST has limited utility in populations with high TB burden and where Bacille Calmette–Guérin (BCG) vaccination is followed as a routine. False-positive (non-TB mycobacterial, previous vaccination with BCG) and false-negative reactions (patients on steroid therapy, coexisting HIV infection, recent TB infection, chronic renal failure and people with typhoid fever, typhus, brucellosis, leprosy, pertussis) can also occur with TST. Abdelrub et al showed that TST was positive in 42.6 per cent of patients with genital TB. Raut et al reported sensitivity and specificity of TST as 55 and 80 per cent, respectively, in women with laparoscopically diagnosed TB.
| Imaging Techniques|| |
The two imaging techniques useful in the diagnosis of FGTB are hysterosalpingography (HSG) and ultrasonography (USG). HSG evaluates the internal structure of the female genital tract and tubal patency whereas USG allows simultaneous evaluation of ovarian, uterine and extrapelvic involvement.
| Hysterosalpingography (HSG)|| |
Genital TB is associated with characteristic structural changes in the organs involved, and HSG is a useful tool in visualizing the abnormalities. In HSG, presentation of tubal TB varies from non-specific changes such as tubal dilatation, tubal occlusion, irregular contour, diverticular outpouching (salpingitis isthmica nodosa), hydrosalpinx to specific pattern such as 'cotton wool plug', 'pipestem tube', 'golf club tube', 'cobblestone tube', 'beaded tube', 'leopard skin tube', tubal occlusion and adhesions in the peritubal region which may present as straight spill, corkscrew appearance and peritubal halo. TB should be strongly suspected in the presence of synechiae, tubal obstruction in the transition zone between the isthmus and ampulla, multiple constrictions, calcified lymph nodes, irregular linear or nodular calcifications in the adnexal area.
The uterine changes due to TB may be seen as specific features such as 'collar-stud abscess', 'T-shaped' uterus and 'pseudounicornuate' uterus or non-specific features such as synechiae formation, uterine contour distortion, obliteration of the uterine cavity, venous and lymphatic intravasations,. Chronic infection may lead to extensive destruction of the endometrium and myometrium resulting in complete narrowing of the uterine cavity called Netter syndrome. It appears in the HSG as a gloved finger consisting of cervical canal and small part of the uterus. Cervical TB is rare as the stratified epithelium of the ectocervix is naturally resistant to bacterial penetration; hence, cervical TB is mostly secondary to TB of the fallopian tubes and endometrium. Cervical involvement is visualized in HSG as irregularity in contours and diverticular outpouching with a feathery appearance, cervical distortion and serrated endocervical canal,. As TB of the cervix will most frequently be misdiagnosed as cervical cancer, the need for ruling out the later immediately is critical in the management.
| Ultrasonogram|| |
The fallopian tubes may appear dilated, thickened and may be filled with clear fluid called hydrosalpinx or thick caseous material called pyosalpinx. The endometrium is affected in 60-90 per cent of cases with genital TB, and the uterine enlargement may be due to filling by caseous material. The endometrium may appear heterogeneous with hyperechoic areas representing foci of calcification or fibrosis, intrauterine adhesions and a distorted uterine cavity. Findings may vary from a normal scan to abnormalities such as thin or thickened endometrium, cornual obliteration, alteration in the endometrial vascularity during midcycle in stimulated menstrual cycles, calcification of the sub endometrium, variation in the uterine artery flow during midcycle, tubal fluid, free and loculated peritoneal fluid, heterogeneous enlargement of ovaries and adnexal fixation. Some findings with greater specificity are oligemic myometrial cysts, follicles with echogenic rims and presence of endometrial fluid along with a hydrosalpinx. Computed tomography and magnetic resonance imaging are employed in FGTB in the presence of an abdominal or pelvic mass.
| Laparoscopy|| |
Although laparoscopy is an invasive procedure, it aids in visual inspection of the ovaries, fallopian tubes, peritoneal cavity and biopsy of the tuberculous lesions. The advantages of combining hysteroscopy with laparoscopy include not only the exclusion of endometrial involvement but also to do interventions such as lysis of synechiae or endometrial priming with oestrogen. The laparoscopic findings suggestive of genital TB may vary from normal appearance to tubercles on the surface, fimbrial block, fimbrial phimosis, tubal beading, peritubal adhesions, periovarian adhesions, tubo-ovarian mass, hydrosalpinx and rigid tubes,. Baxi et al showed that the sensitivity, specificity and negative predictive value of endoscopic evaluations were 85.7, 22.2 and 77 per cent, respectively, when compared with polymerase chain reaction (PCR).
| Histopathological Examination (HPE)|| |
HPE of the specimens shows typical features of TB infection in the form of granulomatous caseous lesions. The demonstration of typical caseous granulomas with giant epithelioid cells is suggestive of TB; however, these lesions also appear in fungal infections, syphilis, leprosy, rheumatoid arthritis, systemic lupus erythematous, pneumoconiosis and sarcoidosis. Mondal reported histopathological findings from 110 FGTB patients which included isolated small-to-medium epithelioid cell granulomas in different stages, caseation and rare detection of acid-fast bacilli (AFB). Features of chronic salpingitis include occasional non-caseating granulomas in the early stage and single and/or multiple confluent epithelioid granulomas in the lamina propria in the later stage. Caseation and AFB may be observed in the tissue sections of Fallopian tubes. In ovarian TB, caseation is rare and granulomas are usually observed in the cortical area of the ovaries. Epithelioid granulomas may be present in cervical TB and caseation, and AFB is a rare entity in vaginal and vulval TB. As TB of the cervix is frequently misdiagnosed as carcinoma, it is critical to differentiate both at the earliest. For maximizing the yield in HPE, specimens should be collected from multiple sites as the infecting organisms are scarce in genital TB,, sampling site may not be the infected site and cyclical shedding leads to inadequate granuloma formation in endometrium. Ideal time for endometrial sampling is the late secretory phase of the menstrual cycle which is favourable to identify the classic giant cells and tubercles.
| Bacteriological Evaluation|| |
Acid-fast bacilli (AFB) staining and culture
Definitive diagnosis of TB requires the isolation of TB bacilli. Conventional methods for diagnosis of TB include microscopy and culture. Microscopy for AFB is a rapid test for diagnosis but with variable sensitivity. Acid-fast [Ziehl–Neelsen (ZN), Kinyon] staining or fluorescent (auramine, rhodamine) staining is generally used. For ZN staining to yield a positive result, a sample should contain 10-10 bacilli/ml. Culture for Mycobacterium is more sensitive and requires 10-100 bacilli/ml of tissue/fluid sample for the diagnostic yield. Though bacteriologic examination of menstrual blood for smear and culture is recommended by some experts, the sensitivity of these tests is quite low. For diagnostic tests on menstrual blood, menstrual fluid can be collected from the vagina on the first day of menstruation. An acid-fast staining of the endometrial curetting is a rapid test and requires 10 organisms per ml for a positive result.
The diagnosis of TB is confirmed based on the identification of M. tuberculosis in culture. Solid cultures are usually performed on the egg-based Lowenstein–Jensen (LJ) medium or agar-based Middlebrook 7H10 medium, and the liquid culture is performed using automated BACTEC Mycobacterial Growth Indicator Tube 960 (MGIT 960) based on modified Middlebrook 7H9 Broth with an oxygen-sensitive fluorescent detection technology. The advantages of liquid culture include its sensitivity, identification of Mycobacterium species and ability to perform phenotypic drug susceptibility tests (DSTs) and genotyping for further molecular epidemiology studies. The disadvantage of culture methods is the time needed for the growth of mycobacteria. Liquid cultures require at least 9-10 days for positive results and six weeks for being considered negative and in LJ medium cultures, the minimum time-to-positivity is 4-8 weeks. Thangappah et al showed that, among the 72 infertile women studied, AFB smear positivity and culture positivity were 8.3 and 5.2 per cent, respectively, when endometrial samples were tested. Goel et al showed that the positivity in LJ medium and BACTEC for premenstrual samples were 1.83 and 8.8 per cent, respectively.
Molecular techniques for the detection of TB are increasingly evaluated and used nowadays. The nucleic-acid amplification tests (NAAT) provide results in a few hours. PCR is a rapid molecular method for identification of nucleic acid sequences specific to M. tuberculosis and other mycobacteria in tissue samples of patients with FGTB. PCR assays can detect <10 bacilli/ml including dead bacilli and has a testing time of 8-12 h. Sensitivity of PCR is higher than culture and histopathology and specificity may be as high as 100 per cent in detecting FGTB,,,. Recognition of genes encoding the virulence determinants, targets in genome and expressing factors are currently important biomarkers for the detection of FGTB. Clinicians should not initiate ATT for patients only on the basis of positive PCR due to high false positivity and should correlate with clinical evidence and laparoscopic findings.
The WHO has banned the usage of serological tests in individuals suspected of any form of active TB, regardless of their HIV status. A retrospective study by Goel et al compared different methods i.e., HPE, smear microscopy, LJ culture, BACTEC culture and PCR-DNA for diagnosing endometrial TB in females with infertility. The study concluded that none of the available tests were sensitive enough to diagnose all cases of genital TB, but conventional methods such as HPE and LJ culture still have an important role in the diagnosis of endometrial TB in resource-limited settings. PCR has higher specificity and sensitivity, faster turnaround time but limited by high false-positive rates. Recently, GeneXpert MTB/RIF assay has been endorsed by the WHO for worldwide application that permits the simultaneous detection of M. tuberculosis and resistance to rifampicin. GeneXpert is a useful diagnostic test for all forms of EPTB and provides results in less than two hours. Further research is needed in identifying the role of Xpert in the diagnosis of FGTB.
Currently, there are no standard guidelines or algorithm for the diagnosis of FGTB, and extensive research is needed for early diagnosis and appropriate interventions. We suggest an algorithm which can aid the clinicians in the diagnosis of FGTB [Figure 1].
|Figure 1: Diagnostic algorithm for female genital tuberculosis (FGTB). PID, pelvic inflammatory disease; ESR, erythrocyte sedimentation rate; TST, tuberculin skin test; AFB, acid-fast bacilli; NAAT, nucleic acid amplification test; PCR, polymerase chain reaction.|
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Differential diagnosis of FGTB varies based on the site of involvement. Tripathy and Sapkal have elaborated a variety of conditions based on the site involved [Table 3].
| Treatment|| |
Treatment of FGTB is similar to pulmonary TB. The regimen recommendation for many forms of EPTB is mostly not based on evidence from vigorous studies as those for PTB and the duration of treatment for six months though debatable is considered adequate. In patients with organisms sensitive to first-line drugs, six-month regimen is highly effective. The WHO treatment guidelines for TB (2010) recommend that patients newly diagnosed with TB should receive a regimen containing rifampicin (R) for six months: intensive phase with isoniazid (H), R, ethambutol (E) and pyrazinamide (Z) for a duration of two months followed by continuation phase with HR for four months. Alternative to the daily regimen is that TB patients may receive a daily intensive phase followed by thrice weekly continuation phase [2HRZE/4(HR)3] or thrice weekly dosing throughout therapy [2(HRZE)3/4(HR)3] provided that each dose is directly observed. Retreatment TB patients who default or relapse from their first treatment course may receive 2HRZES/1HRZE/5HRE. According to Standards for TB Care Guidelines for new TB patients, the initial phase should consist of two months of HREZ followed by HR for four months. Studies have reported the usage of ATT for duration of six months consisting of H, R, E, Z for two months, followed by H and R for the subsequent four months for the management of patients with genital TB,. There is very limited literature available regarding randomized clinical trials which have investigated the optimal drugs and the duration of treatment for genital TB.
Patients should be monitored for adverse drug reactions during the course of treatment. Since all the four drugs can cause hepatitis, monitoring of liver function is absolutely necessary. Good adherence to first-line drugs is essential as irregular drug intake can lead to the development of treatment failure, development of multidrug resistant TB as well as TB recurrence and subsequent complications. The bacteriological confirmation of response to treatment is often not possible due to the difficulty in obtaining follow up samples and lack of follow up guidelines for these patients.
| Treatment Outcomes in Women With Genital Tuberculosis|| |
Laparoscopic findings such as tubercles, caseous tubercles and encysted ascites may disappear after ATT; however, severe findings such as adhesions may persist. Post-ATT hysteroscopy findings show significant differences in Grade I adhesions and Grade II-IIa adhesions. The spontaneous conception rate may vary from 31 to 59 per cent among patients treated with ATT for FGTB with better rates in patients diagnosed and treated earlier. The outcomes of pregnancy may be live birth, spontaneous abortion or ectopic pregnancy,. If the patient fails to conceive spontaneously, assisted reproduction techniques can be considered to increase the conception rate. In a prospective study done in India among patients treated for infertility due to genital TB, the conception rate was reported as 19.2 per cent, with a much lower live birth rate (7.2%). In a study by Jindall et al among PCR-positive and PCR-negative FGTB patients with infertility, treatment with ATT and additional assisted reproduction techniques showed an overall pregnancy rate of 60 per cent.
Surgery was the treatment of choice before the chemotherapeutic era; however, its role is minimal now except in patients with recurrent pelvic pain, persistent pelvic mass or TB sinus and excessive bleeding. There may be a role for limited surgical procedures such as drainage from tubo-ovarian abscesses or pyosalpinx followed by ATT for improved treatment outcomes. Sharma et al have reported complications during laparoscopic procedure among patients with genital TB which include an inability to create pneumoperitoneum, inability to visualize the pelvis, excessive bleeding, injury to the bladder and peritonitis. The surgical procedure of choice is total hysterectomy with bilateral salpingo-oophorectomy with proper chemotherapy coverage. Vaginal hysterectomy in patients with FGTB may be associated with complications such as increased bleeding, peritonitis, bowel injury and flare up in the post-operative period.
| Prevention|| |
Primary prevention of TB includes strategies to minimize the risk of exposure to mycobacteria. It is, therefore, essential to educate patients of pulmonary TB to follow respiratory hygiene at home and in public places and adhere to standard treatment. Specific to genital TB, adopting safe sexual practices may decrease the chances of acquiring genital infection. In countries with high TB burden like India, BCG immunization is used as a preventive strategy. The BCG vaccine is up to 80 per cent effective in preventing the development of severe forms of TB, but its protective effect varies widely in the population.
| Conclusions|| |
Genital TB is a major cause of infertility in women, and prevalence is generally underestimated because of the asymptomatic nature of the infection and diagnostic challenges. Large multicentric studies are needed to estimate the magnitude of FGTB and to identify the most sensitive test for diagnosis. Clinicians need to be aware of this important cause of infertility and menstrual dysfunction in women. Screening for genital TB needs to be a part of evaluation of infertility and menstrual abnormalities. Most of the patients present in advanced stage with scarring, severe fibrosis and adhesions and treatment outcomes, especially with regard to infertility, are poor. Hence, early diagnosis and correct treatment is vital to avoid complications and to restore fertility.
Conflicts of Interest: None.
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[Table 1], [Table 2], [Table 3]