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Clinical diagnosis of pelvic endometriosis: a scoping review
BMC Women's Health volume 15, Article number: 39 (2015)
Accurate and timely diagnosis of endometriosis is associated with confusion. Clinical manifestations, imaging techniques, biomarkers and surgical techniques are used as diagnostic approaches. This paper reviews current evidence on clinical manifestation in order to help practitioners and perhaps improve women’s health.
A review of the literature on clinical diagnosis of pelvic endometriosis that appeared in the English language biomedical journals was performed using PubMed, Science Direct and Google Scholar. The search strategy included the combination of key words ‘endometriosis’ and ‘diagnosis’ or ‘clinical diagnosis’ in the titles or abstracts of articles. The search included all papers published during the year 2000 to 2014. Then, the findings were classified in order to summarize the evidence.
Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement, in all 51 papers were found relevant and included in this review. In general we found three categories of diagnostic approaches for clinical manifestation including: i) diagnosis via symptoms obtained from history taking, ii) diagnosis via signs obtained from physical examination and iii) diagnosis via risk factors obtained from history taking.
Diagnosis of endometriosis is a matter of concern. Since the disease is associated with diverse clinical symptoms and signs, deeper and more comprehensive consideration according to patient’s history and clinical findings is recommended for early and more accurate detection in order to prioritize women for further investigation and contribute to its early management.
Endometriosis is a disease with considerable prevalence. It has been estimated to affect 10% to 15% of women of reproductive age . The disease has several impacts in general physical, mental, and social well-being. The annual cost for hospital admission is estimated to be in a total around 54 million euros . Diagnostic delay of endometriosis is a problematic issue  and it takes 8 to 11 years to be diagnosed with long and expensive diagnostic methods [2,4]. Thus it is essential to contemplate diagnosis as an important topic. The best method for early diagnosis of endometriosis is still full of unknown issues. Research on the diagnosis of endometriosis currently interfaces with four areas including clinical manifestations, imaging techniques, biomarkers and surgical techniques . Laparoscopy, which is considered as the golden standard in endometriosis diagnosis has considerable risks , and other diagnostic methods are presented as inaccurate and with some limitations . Therefore it seems that for developing clinical and non-surgical approaches for early detection of disease, effort is needed to have a better understanding of signs and symptoms of the disease .
Although there are several useful overview papers on endometriosis, most published papers are unfocused and usually discuss about all aspects of the disease including pathophysiology, diagnosis and treatment. While there is not any internationally recognized noninvasive method for diagnosis, most presurgical diagnostic methods are clinical judgment based on medical history, symptoms and signs . Thus, this study aimed to review the literature on clinical diagnosis of endometriosis in order to discover the clinical criteria for achieving broader and deeper insight on the topic. Clinical manifestations of endometriosis are very broad and diverse issue with a wide range of changes . Particulalrly here we focus on current research on the history taking and physical examination of endometriosis. It is hoped that this review may help to bring more attention about clinical diagnosis of endometriosis and consequently aid in decreasing diagnostic delay and perhaps contribute to improved women’ health.
Endometriosis is defined as the presence of endometrial tissue (gland and struma) outside the uterus . Endometriosis has been found in almost all of the tissues and organs of the body . In this study we focused on pelvic endometriosis because pelvic endometriosis is the most common form of the disease, and it mostly affects women during their reproductive life .
The search engines included PubMed, Science Direct and Google Scholar using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline .
The search strategy included the combination of key words ‘endometriosis’ and ‘diagnosis’ or ‘clinical diagnosis’ in the titles or abstracts of articles.
Inclusion and exclusion criteria
All qualitative and quantitative articles in English language biomedical journals from year 2000 to 2014 on pelvic endometriosis were included. Case reports and articles on non-pelvic endometriosis were excluded. The year 2000 was chosen because the intention was to include more recent literature in this systematic review. The initial search was carried out in January 2013 and updated twice in March 2014 and February 2015.
The findings from each idivdual paper on clinical diagnosis were retrieved, and were classified. Then different tables were provided to summriaze and present the findings.
A total of 2749 citations were identified and after exclusion of duplicates, the abstracts of 1272 citations were screened. Of these, 113 papers were found relevant. However, 51 articles met inclusion criteria and were included in this review. The study selection process is shown in Figure 1. Overall we found 16 overview/commentary publications [2,9,14-27], 33 original research articles [1,7,8,11,12,28-53], two meta-analysis [54,55] and 2 systematic reviews [56,57].
Review of overview papers
A summary of overview/commentary publications is presented in Table 1. In general, these articles focused mainly on symptoms and treatment of the endometriosis. The emphasis of most papers was on pain, infertility and chronic fatigue.
Clinical diagnosis was achieved by different approaches. We have classified these methods in three groups: i) clinical diagnosis by symptoms obtained from history taking, ii) clinical diagnosis by signs obtained from physical examination and iii) clinical diagnosis by risk factors obtained from history taking. These are summarized as follows:
Clinical diagnosis by symptoms obtained from history taking
By taking a careful history of patients and considering their symptoms, the disease may be greatly suspected. Many studies recognized symptoms, which were very common such as cyclic or perimenstrual symptoms . A summary of findings on symptoms obtained from history taking are presented here:
Included dysmenorrhea (during and at the end of menstruation) [2,7-9,15-17,19-26,28,29,32-37,42,53,54], pelvic pain before and during menstruation [2,7,14,16-18,21,23,25,33,34], and pain during sexual intercourse or after sex (dyspareunia) [2,7-9,11,15-17,19-25]. Dyspareunia was occurred only with deep thrusting . Lower abdominal pain or suprapubic pain, lower back pain [11,14,17,20,21,29] and loin pain [17,20] were also mentioned. Pelvic pain was present as chronic pelvic pain (lasting ≥6 months) and patients reported that they were suffering from intermenstrual pain (non-period pelvic pain) or ovulation pain [2,7,15,16,19-24,33,34,37,42]. Rectal pain was also mentioned [11,21]. Pain character was found to be throbbing [31,35], dull or sharp and exacerbated by physical activity . Pain often worsened over time and changed in character .
Included abdominal bloating, diarrhea with period, painful bowel movements and painful defecation (dyschezia) during menses, hematochezia, nausea and stomach upset at the time of period, constipation, [11,14,16-20,22,24,25,28,29,34,35], irritable bowel syndrome (IBS) [7,32] and early satiety .
Included gynecological infections and low resistance to infection, candidiasis [11,29,33] infertility [2,7-9,16,17,19,21,23-25,29,34,36,37,42,45], pelvic inflammatory disease, ovarian cysts [7,32,33] and postcoital bleeding .
Social life symptoms
Some symptoms such as inability to carry on normal activities including work or school were reported by patients . Depressed and anxious feelings , irritability or premenstrual tension syndrome , and psychoemotional distress and alexithymia were also mentioned .
Included muscle/bone pain, joint pain and leg pain .
Patients reported suffering from chronic fatigue, exhaustion, low energy and low-grade fever [2,11,16,18,21,29]. Women also reported burning or hypersensitivity, symptoms that were suggestive of a neuropathic component . Mictalgia was also mentioned . Previous surgery for endometriosis also was found a considerable factor [31,42]. The findings are presented in Table 2.
Clinical diagnosis by signs obtained from physical examination
Clinical signs of the disease that identified by physical examination (pelvic examination by inspection and palpation) included a broad range of signs. External genitalia and the vaginal surface were usually unremarkable . Findings of physical examination are listed as follows:
Visible red, blue, or hemorrhagic nodules on the external genitalia .
Posterior vaginal fornix
Pouch of Douglas
The most reported signs included changes in uterus, cervix, adnexa and uterosacral ligament palpation. The findings are shown in Table 2.
Clinical diagnosis by risk factors obtained from history taking
Although it was reported that the following risk factors alone are not enough, they could potentially direct physicians toward clinical diagnosis of pelvic endometriosis. All risk factors are presented in Table 3.
Risk factors related to menstrual periods
Included early menarche (before age 11–13) or late menarche (menarche at ≥14 y) [12,15,20,33,39,54], short menstrual cycle (≤27 days) [15,17,20,32,58], longer menstrual flow (≥7 days) [15,30], and spotting before onset of menses [11,15,19,23,29,51]. Late menopause , early history of dysmenorrhea , obstruction of menstrual outflow for example mullerian anomalies and use of pads and tampons were other risk factors [17,20].
Risk factors related to patients’ characteristics
Patients who were taller, thinner and had lower body mass index, red hair [1,15,39,40,43] and dysplastic nevi  were found to be more prone to pelvic endometriosis. Higher education was considered as another risk factor . Rh-negativity , severe teenage acne  and blue eye color  were also mentioned as risk factors for pelvic endometriosis.
Risk factors related to obstetrics and gynecologic history
Risk factors related to family history
Risk factors related to nutrition
Consumption of red meat and trans fats were associated with an increased risk of endometriosis, and eating fruits, green vegetables, and omega-3 long-chain fatty acids were associated with a decreased risk .
Risk factors related to embryonic factors
Included exposure to diethylstilbestrol in utero and low birth weight .
Risk factors related to patient’s habits
Risk factors related to race
Asian origin increased the risk of the disease .
However, prolonged lactation, multiple pregnancies, the combined oral contraceptive, smoking and exercise are reported as protective factors . The most risk factors were related to menstrual periods, patients’ characteristics and family history.
The emphasis of this review was on several aspects of the clinical diagnosis of pelvic endometriosis. All factors that could have been of any help in clinical diagnosis of the disease were reviewed and classified. These findings divided in three main categories. Moreover this article showed that there were many more symptoms than have traditionally associated with endometriosis.
Usefulness of clinical signs and symptoms in the diagnosis of pelvic endometriosis in women who present with infertility was shown in some studies . In addition, it has been reported that some symptoms had greater predictive value. The most commonly reported symptoms leading to a diagnosis were dysmenorrhea and pelvic pain. Treloar et al. reported that dysmenorrhea was associated with a 2.5-fold increased risk of subsequent endometriosis . Pelvic pain was reported by all patients in a study by Greene et al. . Among the other symptoms leading to a diagnosis, subfertility and an ovarian mass were more commonly reported in stages 3–4, whereas dyspareunia was more common in stages 1–2 . Women with endometriosis were 9 times as likely to report dyspareunia as compared to a control group . In Nnoaham et al. study painful defecation during menstruation and a history of benign ovarian cysts strongly predicted any stages of the disease. The stage III and IV disease was predicted with good accuracy based on symptom-based model. They used several variables in their model including indications for surgery, menstrual history, dysmenorrhea, dyspareunia, pelvic pain, bowel/urinary symptoms, pregnancy/infertility history, personal characteristics and family history .
Chapron et al. showed that variables such as painful defecation during menses, severe dyspareunia, pain other than noncyclic, and previous surgery were considered as independent predictors for posterior deep infiltrating endometriosis. They showed a diagnostic model that used two independent predictors: painful defecation during menses and severe dyspareunia. The sensitivity of this model for diagnosing posterior deep infiltrating endometriosis was 74.5% and its specificity was 68.7%. They concluded that standardized evaluation of painful symptoms is useful for screening the disease . Pelvic inflammatory disease and ovarian cysts were 6 and 12 times as likely to be made in women with endometriosis .
Although no test provides strong evidence for the presence of endometriosis, the symptom of uterosacral pain had the highest positive likelihood ratio for the diagnosis of endometriosis . In addition to the classic symptom of pain, other symptoms such as fatigue, exhaustion, low energy, gastrointestinal problems, abdominal bloating, and a range of allergic diseases also showed a positive association with endometriosis. These are usually dismissed because they are not widely known. These symptoms are very important. A study by Lemaire showed that the three symptoms with highest total symptom distress were fatigue or weariness, menstrual cramping and nonperiodic pelvic pain .
Women with endometriosis were twice as likely to report urinary symptoms such as dysuria, cystitis, and urinary tract infections compared with control group . Sinaii et al. did not report any significant relationship between endometriosis and regular, vigorous exercise, regular use of talc as body powder and cigarette smoking , but other studies have found a significant association between smoking and endometriosis . In Hediger study, patients were more likely to be late maturers (menarche at ≥14 y)  while in other studies early menarche was often cited as a risk factor for endometriosis . In Parazzini study age at menarche and lifelong type of menstrual cycles were not related to the risk of deep or pelvic and ovarian endometriosis . So it seems that further studies are needed to clarify this relationship.
The risk of the disease raised by advancing age within the reproductive years, peaking among women aged 40–44 years . The findings of the Ballweg’s study indicated that the disease was more severe with an early age of onset and thus it is necessary to pay more attention to girls suffering from menstrual pain . Most studies have shown a significant relationship between endometriosis and length of menstrual cycle, menstrual volume, occurrence of irregular menstrual periods, recent pelvic pain or dyspareunia except one  which may be attributed to the small sample size of the study. In the Flores’s study among Puerto Rican women the diagnosis of endometriosis was significantly associated with dysmenorrhea, dyspareunia, and chronic pelvic pain, but not with menstrual cycle characteristics . This was probably due to their study on Hispanic population. In Treloar et al. study no association was found between endometriosis and duration of natural menstruation, heaviness of flow, type of sanitary protection used and history of sexual intercourse during menstruation which may be due to recall bias or small size of control group . Ballard and Mangubat showed that menorrhagia in women with endometriosis was 5 times higher that controls .
Lafay et al. showed that patients with the lowest BMI (≤18.5) were at a higher risk of deep infiltrating endometriosis. BMI was significantly lower in deep infiltrating endometriosis and ovarian endometrioma patients but not for the superficial endometriosis patients . In Yi et al. study, women with advanced-stage endometriosis had lower BMI than those with minimal or mild disease, and BMI was significantly associated with disease severity . These findings are in line with other studies [39,40], but in Kennedy study the risk of the disease was increased for women with greater peripheral fat . Borghese et al. showed that Rh-negative women were twice as likely to develop endometriosis. . However, there is controversy about the relationship between blood group and endometriosis [46,59,60] and further investigation is needed to determine the role of blood groups in the development of endometriosis. In a study by Xie et al. it was reported that women who had severe teenage acne had a 20% increased risk of endometriosis. Probable mechanisms for such observation might be due to genetic factors, sex hormones including estrogens and immune malfunction . Blue eye color also was another factor. It is argued that perhaps genetic factors, and vitamin D deficiency due to photo-sensitivity might lead to a relationship between eye color and endometriosis . Several studies have shown that the risk of allergic disease could be increased with endometriosis .
In Kashima et al. study the relative risk of endometriosis in female siblings of patients was 5.7 , which were consistent with other findings . These findings propose a familial tendency and a genetic factor for endometriosis.
Endometriosis occurs more commonly in middle-aged, upper class, ambitious, white women. This may occur due to greater access to medical care and diagnostic tests such as laparoscopy in these women . Several studies have shown different results about the relationship between physical activity and endometriosis so there is inconclusiveness regarding the benefits of physical exercise as a risk factor for the disease .
Two important signs must be considered: deep dyspareunia and nodules in the pouch of Douglas . Findings of physical examination vary significantly with location of endometriotic lesions. They can be seen on speculum examination in only 14% of patients, and a classic, painful, spheric nodule can be palpated in only 43% . In Chapron study a nodule was found in 80% of patients with vaginal endometriosis, this rate dropped to only 35% and 33% in those with deep infiltrating endometriosis of the digestive tract and uterosacral ligaments, respectively . High locations of deep infiltrating endometriosis lesions at the level of uterosacral ligaments, bottom of the pouch of Douglas and upper one-third of the posterior vaginal wall explain why results of routine clinical examination are so poor. Cheewadhanaraks showed a positive predictive value of tenderness and/or nodularity of the cul-de-sac and/or uterosacral ligament(s) in diagnosis of the endometriosis . In Howard study no findings on physical examination, including cervical deviation, cervical tenderness, or paracervical tenderness were predictive for the disease  but in Bazot et al. study the sensitivity of physical examination was 73.5% for uterosacral ligament endometriosis, 50% for vaginal endometriosis and 46% for intestinal endometriosis. The accuracy of physical examination is higher during menstruation .
Eskenazi et al. reported that ovarian endometriosis, but not nonovarian endometriosis, could be reliably predicted with noninvasive procedures. They used history, pain reports, physical examination and ultrasound for prediction and found that these procedures have moderate success in predicting a surgical diagnosis of endometriosis .
Attempts to diagnose women using symptoms, clinical findings or ultrasonography had disappointing findings except, possibly, for ovarian endometriosis in Hediger et al. study . Women with endometriosis experience significantly more gynecological, urological and bowel symptoms than women without endometriosis , and that the risk of endometriosis increases in women with endometriosis-related symptoms .
Clinical diagnosis of pelvic endometriosis is difficult. Thus considerable efforts are needed to improve the clinical diagnosis of pelvic endometriosis because it could help to prioritize women for further investigation and contribute to its early diagnosis. However, this review provides integrated findings from the literature containing issues related to signs, symptoms and risk factors. The findings suggest that better diagnosis of pelvic endometriosis need a careful and comprehensive investigation about risk factors during history taking and clinical visits. Perhaps every notes during this period by clinicians and midwifes might lead to timely diagnosis and treatment. Further studies with much more focus on signs and symptoms of the disease are recommended for clarifying the present contradictions.
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This manuscript was originated from the PhD thesis of the first author at Department of Midwifery and Reproductive Health, Faculty of Medicine, Tarbiat Modares University.
The authors declare that they have no competing interests.
HR was the main investigator and carried out the study. NT and SZ supervised the study. EM and EH were the study advisors and involved in data synthesis. AM contributed to conducting the systematic review, the writing process, responded to the reviewers’ comment and prepared the final draft. All authors read and approved the manuscript.
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Riazi, H., Tehranian, N., Ziaei, S. et al. Clinical diagnosis of pelvic endometriosis: a scoping review. BMC Women's Health 15, 39 (2015) doi:10.1186/s12905-015-0196-z
- Pelvic Pain
- Pelvic Inflammatory Disease
- History Taking
- Uterosacral Ligament