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Revista da Associação Médica Brasileira

Print version ISSN 0104-4230

Rev. Assoc. Med. Bras. vol.60 no.6 São Paulo Nov./Dec. 2014 


Endometriosis is an important cause of pelvic pain in adolescence

Endometriose é causa importante de dor pélvica na adolescência

Marina de Paula Andres 1   *  

Sergio Podgaec 2  

Karina Belickas Carreiro 3  

Edmund Chada Baracat 4  

1Collaborating Physician at Hospital das Clínicas, Faculty of Medicine, University of São Paulo (HC-FMUSP), Brazil

2Post-doctoral Professor at the Division of Gynecology at the Faculty of Medicine, University of São Paulo, Head of the endometriosis clinic at HC-FMUSP, Brazil

3Resident Physician at the Gynecology Division at HC-FMUSP, Brazil

4Full Professor of Gynecology, FMUSP, Brazil



despite endometriosis being a common disease, where early detection is key to preventing its progression, it is a condition often overlooked in adolescents. The aim of this study was to report the clinical characteristics of adolescent patients with endometriosis monitored in a tertiary hospital.


a retrospective study of 394 patients undergoing surgery with a histological diagnosis of endometriosis at the Endometriosis Division of the Gynecology Department at the Hospital das Clínicas of the University of São Paulo Medical School from 2008 to 2013. 21 adolescents were included (aged under 21 years).


the age ranged from 17.95 ± 1.48 years, the average time for diagnostic confirmation was 2.96 ± 2.93 years, and the age at the onset of symptoms was 15.28 ± 3.03 years on average. The sites affected were ovarian (38%), peritoneal (47.6%) and retrocervical (23.8%). Dysmenorrhea was found in 80.9 % of adolescents (severe in 33.3% of cases) and chronic pelvic pain in 66.6%.


endometriosis in adolescents is an important differential diagnosis from pelvic pain and ovarian cysts, mainly among those with no response to conventional treatment. The main forms of involvement are peritoneal and ovarian. Despite the onset of symptoms in adolescence and advances in imaging methods, the diagnosis of this disease is still delayed.

Key words: endometriosis; adolescent; dysmenorrhea; ovarian cysts



embora a endometriose seja uma doença prevalente, cujo diagnóstico precoce é fundamental para a prevenção de sua progressão, é uma condição frequentemente negligenciada em adolescentes. O objetivo deste estudo é levantar as características clínicas das pacientes adolescentes com endometriose acompanhadas em um hospital terciário.


levantamento retrospectivo de 394 pacientes submetidas à cirurgia com diagnóstico histológico de endometriose no Setor de Endometriose da Divisão de Clínica de Ginecologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, de 2008 a 2013. Foram incluídas 21 adolescentes (idade menor de 21 anos).


a idade média foi de 17,95±1,48 anos, a média de tempo para a confirmação diagnóstica foi de 2,96±2,93 anos e a idade do início dos sintomas foi em média de 15,28±3,03 anos. Os locais de acometimento foram ovariano (38%), peritoneal (47,6%) e retrocervical (23,8%). Dismenorreia esteve presente em 80,9% das adolescentes (sendo severa em 33,3% dos casos) e dor pélvica crônica em 66,6%.


endometriose em adolescentes é um importante diagnóstico diferencial de dor pélvica e cistos anexiais, principalmente entre aquelas sem resposta ao tratamento convencional. As principais formas de acometimento são peritoneais e ovarianas. Apesar do início dos sintomas na adolescência e dos avanços nos métodos de imagem, ainda se observa demora no diagnóstico dessa doença.

Palavras-Chave: endometriose; adolescente; dismenorreia; cistos ovarianos


Endometriosis is a gynecological disease defined by the presence of glands and/or endometrial stroma outside the uterine cavity.1 The sites of disease involvement are the ovaries and retrocervical region, most often beyond the pelvic peritoneum, vagina, rectum, sigmoid, appendix, ureter and bladder, among others.2 One of the most common gynecological diseases, it may be present in 1015% of women of childbearing age and up to 70% of women with a diagnosis of chronic pelvic pain.1,3 Its etiopathogenesis is still controversial and several theories have been proposed to justify the presence of the disease.1,4,5 It can be classified as superficial, ovarian and deep, the latter being characterized by the infiltration of endometrial implants above a depth.6,7

Endometriosis presents diverse clinical presentations. The main complaint of patients with endometriosis is chronic pelvic pain (non-cyclical) and dysmenorrhea, with an incidence of up to 75%. Other complaints include infertility, deep dyspareunia and cyclic urinary and intestinal disorders associated with the menstrual period.5 The prevalence of endometriosis can reach 40-60% in patients complaining of dysmenorrhea and 30-40% in women complaining of infertility.6,8-11

This clinical condition can affect women during the reproductive period, including adolescence, defined as transition from childhood to adulthood, occurring between 10 to 19 years according to the World Health Organization (WHO).12 The main gynecological complaint by adolescents is dysmenorrhea, which affects between 60 and 93% of these patients. In most cases, this is primary or functional dysmenorrhea related to more frequent ovulatory cycles after 2 to 3 years of menarche. The pathophysiology of primary dysmenorrhea is still controversial and involves the release of leukotrienes and prostaglandins which cause systemic symptoms such as nausea and headache, and local pelvic symptoms, secondary to potent vasoconstriction and myometrial contraction, leading to ischemia and pain.13 Despite the high prevalence of dysmenorrhea in adolescents, many girls do not seek professional help or treatment.14 In a 2006 study, Houston et al.15 reported that 98% of teens use non-pharmacological therapies such as rest and warm compresses (with success rates of 40% or less) and 30-70% self-treatment with simple analgesics, with 57% using doses below those recommended.15

Secondary dysmenorrhea is that related to pelvic abnormalities and can be found in up to 10% of adolescents with endometriosis as the primary cause.13 As the incidence of gynecological diseases increases with age, secondary dysmenorrhea is more prevalent in young adults than adolescents.13

The treatment of endometriosis in adolescents presents particularities owing to the age of the patients. The use of hormonal contraceptives and anti-inflammatory drugs does not have any restriction, however, the use of GnRH analogues should be analyzed because of its side effects.16


Although endometriosis is a common disease, where early detection is key to preventing its progression, it is a condition often overlooked in patients during puberty. The aim of this study was to report the clinical characteristics of adolescent patients with endometriosis monitored in a tertiary hospital.


The study was conducted retrospectively by surveying medical records, thereby exempt from the approval of the Research Ethics Committee.

A retrospective analysis of the database belonging to the Endometriosis Sector at the Gynecology Clinic Division at the University of São Paulo Medical School’s Hospital das Clínicas, (HC-USP) was conducted in the period from 2008 to 2013. The inclusion criterion was patients up to 20 years of age with a histologically confirmed diagnosis of endometriosis.

After anamnesis and clinical examination, all patients with clinically suspected endometriosis underwent a specialized image evaluation for this purpose, with transvaginal ultrasound and pelvic examination with bowel preparation prior to the exam or magnetic resonance imaging of the pelvis (if the patient had not started sexual activity). Clinical data related to the different pains reported by patients are measured by a visual analog scale, ranging from zero to 10, where 10 is the worst pain.

Clinical hormonal treatment with combined contraceptives or continuous progestogens is indicated for patients who do not present evidence of lesions in this assessment (as it may be superficial endometriosis), or in cases of ovarian endometriomas less than 3 cm or when there is deep endometriosis, provided this does not affect the ureter, appendix, terminal ileum and or rectosigmoid in conditions of sub-occlusion. Periodically, at average intervals of 6 months, patients are clinically reassessed and undergo imaging exams, where appropriate. Medication treatment failure is considered if there is no improvement in symptoms (measured with the aid of the visual pain scale) and/or an increase in lesions, even during the course of steroid hormone use. When there are no lesions visualized in the imaging exam, then diagnostic laparoscopy is recommended and, in the case of deep endometriosis and/or ovarian endometrioma surgical treatment of the diseases is recommended.

Using this protocol, from the 394 patients undergoing surgery with a diagnosis of endometriosis in this period, 21 adolescents were selected from this group. In addition to the data above, all patients were assessed for symptoms, age at diagnosis, duration of clinical history, level of education, site of onset of the disease, and family history. They were also assessed in relation to the presence of outbreaks of disease in the peritoneum, ovaries and/or deep infiltrative locations.


The mean age of patients was 17.95±1.48 years, ranging from 13-20 years. The race of patients was predominantly white (n = 15), corresponding to 68% of cases. The level of education was high in affected patients, corresponding to 72.7% (n = 16) with a high school diploma or still studying at this level. Only two patients presented a family history of endometriosis (Figure 1).

FIGURE 1 Number of adolescents with endometriosis by age. Hospital das Clínicas. 2008-2013. 

The average time elapsed between onset of symptoms and the diagnostic confirmation was 2.96±2.93 years, ranging from six months to four years, and the age of onset of symptoms was 15.28±3.03 years on average (Table 1). The sites affected by the disease are described in Table 2.

TABLE 1 Clinical condition of adolescents with endometriosis 

Symptoms % (n)
Dysmenorrhea 80.9 (17)
Light (VAS 1 to 4) 28.5 (6)
Moderate (VAS 5 to 7) 19 (4)
Incapacitating (VAS 8 to 10) 33.3 (7)
Chronic pelvic pain 66.6 (14)
Infertility 4.7 (1)
Deep dyspareunia 33.3 (7)
Cyclic bowel symptoms 14.2 (3)

VAS: visual analogue scale for pain (zero to 10).

TABLE 2 Clinical characteristics of adolescents with endometriosis 

Clinical characteristics % (n)
Family history of endometriosis 9.4(2)
White 71.4 (15)
Black 23.8 (5)
Mixed 7 (1)
Site affected by the disease  
Ovaries 38 (8)
Superficial peritoneal 47.6 (10)
Retrocervical 23.8 (5)
Retrocervical and ovaries 9.4 (2)

After surgery, 19 patients received adjuvant clinical treatment: combined oral contraceptives (42.8%), GnRH analogue (33.3%), oral progestogen (19%), levonorgestrel-releasing intrauterine system (4.7%) and Danazol (4.7%).


It is estimated that the prevalence of endometriosis in adolescents is 45-70% in those undergoing laparoscopy for chronic pelvic pain.13,16 In the present study, among adolescent patients with a confirmed endometriosis diagnosis, the mean age was 18.24±1.48 years, ranging from 13-20 years. The median age is 17 years, in accordance with other studies in the literature where the average age of diagnosis was 18.6 years.16

As presented in other studies, the incidence of endometriosis is higher in white patients. In this study, the incidence was 68% of patients. Templeman reported a higher incidence of school absenteeism among white patients with endometriosis than in black patients, which may represent a higher proportion of disease in this group of adolescents.17 The importance of endometriosis in patients with a higher educational level was also noted in this study, as 72.7% of patients had been attending high school, which has also been observed by other authors.17-19

We noted that the average time elapsed between onset of symptoms of pain and the diagnostic confirmation was 2.96 ± 2.93 years, varying from six months to four years, and the age of onset of symptoms was 15.28 ±3.03 years on average. Part of these complaints reported by the adolescents should be considered as relating to common psychosocial disorders during this period of life, which ultimately cause delays in the diagnosis of chronic diseases. According to the American Association of Endometriosis, 66% of adult women describe the onset of complaints of pelvic pain before reaching 20 years of age, and even those that seek help from specialists need at least four professionals to reach the correct diagnosis. Patients with symptoms of endometriosis before 19 years of age took an average of 12.1 years for the diagnosis of endometriosis, while women over 30 took 3.3 years.2, 8,13,20

Arruda et al.21 applied questionnaires to 200 patients, on average, 26 months after histological diagnosis of endometriosis. Among the patients analyzed, 2.5% were aged less than 20 years, 50% were between 30 and 39 years, and 20.5% were older than 40 years. The main complaint was dysmenorrhea, present in 67% of patients, and chronic pelvic pain was found in 12.5%, infertility in 10%, dyspareunia in 5.5%, and more than one symptom in 88%. The mean interval between onset of symptoms and diagnosis of endometriosis was seven years, taking nine years when the symptoms began in adolescence, and only three years when started after 30 years of age. Patients with complaints of pelvic pain took on average six months to see a doctor, while patients complaining of infertility took on average 1.7 years. Although 44% of patients develop symptoms before 20 years of age, only 3.5% received a definitive diagnosis in this age group.21 Another study published in 2010 was based on data from 12 centers in Italy, which study patients with endometriosis. 39 patients aged between 10 and 21 years were evaluated, regarding complaints presented and laparoscopic findings with histological confirmation. The average age at diagnosis was 18.6 years, with three cases diagnosed before 15 years of age. Genital malformations that could justify the precocity of the diseases were not observed. The main complaint triggering the start of the investigation was chronic pelvic pain with non-cyclic presentation or acute pelvic pain. In three patients, the investigation was based on adnexal masses.16 A study conducted in New Zealand assessed 163 patients with histological diagnosis of endometriosis in the period from 2003 to 2009. 20 of these patients were adolescents. Among adolescent patients, the main complaint was dysmenorrhea in 80% versus 55% among adults, and the use of more than one analgesic for pain control was 95%  versus 59%, respectively.22

In over half the cases evaluated in our study, the adolescents had moderate or disabling intensity dysmenorrhea (VAS over 5), with 16 of them being part of their initial complaint. Chronic pelvic pain was also noted in the majority of patients (66.6%). This data is corroborated by the literature, in which the symptom leading to diagnosis of the disease was chronic or acute pelvic pain in 79% of patients, and pelvic mass in 21%.14-16,17, 23

The majority of disease involvement was peritoneal (47.6%) and ovarian (38%). Deep endometriosis was diagnosed in 33.3% of adolescents, with retrocervical involvement in all of them, with no correlation with an exuberant clinical picture. The main symptom presented by this group was non-cyclic pelvic pain. In the literature, the early stages are less frequent in adolescents and ovarian endometriosis is common, suggesting that despite pain being the main symptom leading to gynecological examination, surgery is most appropriate when there are ultrasound findings of ovarian cysts.16,24

Postoperative treatment was mostly with combined oral contraceptives (42.8%). The levonorgestrel-releasing intrauterine system was only used in one patient and the GnRH analogue was used in 33.3% of them. It should be highlighted that GnRH should not be used in patients younger than 17 years and its use should be for short periods due to the effects of hypoestrogenism, mainly hot flushes and osteopenia.16


Endometriosis in adolescents is a disease to be considered as an important differential diagnosis in pelvic pain and adnexal cysts, especially among those with pain resistant to the use of commonly used medication. The main forms of involvement are peritoneal and ovarian, and despite advances in imaging methods, there is still a delay in diagnosis of this disease, which often has symptoms starting in adolescence, bringing physical and emotional damage, with a major impact on quality of life in such girls. The gynecologist should be aware of the signs and symptoms to make an early diagnosis, thereby preventing progression of the disease and providing the most appropriate treatment for each patient

Study conducted at the Hospital das Clínicas, Faculty of Medicine, University of São Paulo (FMUSP), São Paulo, SP


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Received: July 02, 2014; Accepted: July 23, 2014

*Correspondence: Address: Av. Dr. Enéas de Carvalho Aguiar, 255, Cerqueira César, São Paulo – SP.

Conflict of interest: none

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