Primary Amenorrhea Overview
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Questions and Answers

Define primary amenorrhea.

Primary amenorrhea is the absence of menstrual bleeding in a girl by age 14 without secondary sexual development or by age 16 with secondary sexual development.

What is the most likely diagnosis for a 17-year-old girl with primary amenorrhea and normal secondary sexual characteristics?

Mullerian agenesis is the most likely diagnosis in this case.

What is the next step in the diagnosis for a suspected case of Mullerian agenesis?

Serum testosterone levels or a karyotype analysis should be performed next.

List two potential causes of primary amenorrhea associated with normal secondary sexual characteristics.

<p>Imperforate hymen and transverse vaginal septum are two such causes.</p> Signup and view all the answers

How is primary amenorrhea classified based on secondary sexual characteristics?

<p>It is classified into two categories: primary amenorrhea with normal secondary sexual characteristics and primary amenorrhea with abnormal secondary sexual characteristics.</p> Signup and view all the answers

Explain the physiological causes of amenorrhea during pre-puberty.

<p>Physiological amenorrhea in pre-puberty is due to the lack of ovarian function or hormonal influence before the onset of puberty.</p> Signup and view all the answers

What are the implications of diagnosed primary amenorrhea on fertility management?

<p>Primary amenorrhea may indicate underlying reproductive system issues that could impact fertility, necessitating systematic investigations.</p> Signup and view all the answers

Identify the role of the hypothalamus in the menstrual cycle.

<p>The hypothalamus regulates the release of hormones that control the menstrual cycle through the pituitary gland.</p> Signup and view all the answers

What are the two main classifications of absent secondary sexual characteristics in terms of stature?

<p>Normal stature and short stature.</p> Signup and view all the answers

Differentiate between congenital and acquired hypogonadotropic hypogonadism.

<p>Congenital includes isolated gonadotropin-releasing hormone deficiency and olfactogenital syndrome, while acquired can result from weight loss, excessive exercise, or hyperprolactinaemia.</p> Signup and view all the answers

What condition is characterized by gonadal agenesis in individuals with XX or XY chromosomal make-up?

<p>Gonadal agenesis is a form of hypergonadotropic hypogonadism.</p> Signup and view all the answers

How can breast development serve as an indicator of estrogen production?

<p>Presence of breasts indicates adequate estrogen production, while absence indicates inadequate estrogen exposure.</p> Signup and view all the answers

What symptoms may indicate the presence of an imperforate hymen in early childhood?

<p>Symptoms include a bulging hymen and the presence of a mucocele.</p> Signup and view all the answers

What is haematometra and when does it occur?

<p>Haematometra is the accumulation of menstrual blood within the uterine cavity, often resulting from an obstruction like an imperforate hymen.</p> Signup and view all the answers

In the context of sex development disorders, what is the significance of identifying whether a uterus is present or absent?

<p>It helps in evaluating reproductive potential and diagnosing conditions like Turner syndrome.</p> Signup and view all the answers

What complications can arise from a transverse vaginal septum?

<p>Complications include separation of the upper and lower parts of the vagina potentially leading to obstructive symptoms.</p> Signup and view all the answers

What is Mayer-Rokitansky-Kuster-Hauser (MRKH) syndrome and what is its primary sign?

<p>MRKH syndrome is characterized by the absence of the vagina and a non-functioning uterus, with a primary sign being a blind-ending vaginal dimple usually not more than 1.5 cm in depth.</p> Signup and view all the answers

What are the common associated anomalies with MRKH syndrome?

<p>Approximately 40% of patients with MRKH syndrome have renal anomalies such as an absent kidney and may also have skeletal abnormalities.</p> Signup and view all the answers

Explain the role of the androgen receptor in androgen insensitivity and its effects on physical development.

<p>In androgen insensitivity, mutations in the androgen receptor gene result in a non-functional receptor, preventing the masculinizing effects of testosterone and leading to a phenotypically female appearance.</p> Signup and view all the answers

What presenting symptom is common in both MRKH syndrome and the failure of cervical development?

<p>Cyclical abdominal pain is a common presenting symptom in both MRKH syndrome and cases of failed cervical development.</p> Signup and view all the answers

What distinguishes the uterine development in patients with androgen insensitivity?

<p>Patients with androgen insensitivity have normal external female genitalia but lack a uterus and upper vagina.</p> Signup and view all the answers

What condition is described as a rare cause of primary amenorrhea marked by elevated levels of gonadotrophins?

<p>Resistant ovary syndrome is characterized by elevated gonadotrophin levels despite the presence of apparently normal ovarian tissue.</p> Signup and view all the answers

What is a key physical examination finding in individuals with MRKH syndrome?

<p>A key finding in MRKH syndrome is the presence of normal female external genitalia along with a blind-ending vaginal dimple.</p> Signup and view all the answers

How is the vaginal structure affected in individuals with developed uterine bodies but absent cervixes?

<p>In this condition, while the uterine body may be normally developed, there is a failure of upper vaginal development, leading to no vaginal space for distension.</p> Signup and view all the answers

What are two potential causes of ovarian failure in patients who underwent treatment for childhood malignancy?

<p>Chemotherapy and radiotherapy.</p> Signup and view all the answers

How does galactosaemia lead to ovarian cellular destruction?

<p>Due to the deficiency of galactose-1-phosphate uridyltransferase, toxic accumulation of substances results in ovarian cellular destruction.</p> Signup and view all the answers

What is a common congenital infection that can lead to hypogonadotrophic hypogonadism?

<p>Hydrocephalus.</p> Signup and view all the answers

What syndrome is characterized by a chromosomal composition of 45X and associated ovarian failure?

<p>Turner's syndrome.</p> Signup and view all the answers

What developmental milestone should be noted in the history of a patient with primary amenorrhea?

<p>The age of thelarche.</p> Signup and view all the answers

Why is it important to calculate Body Mass Index (BMI) during the physical examination of a patient with amenorrhea?

<p>Because a decrease in body weight may indicate underlying issues such as hypopituitarism or Turner’s syndrome.</p> Signup and view all the answers

What physical findings might indicate a diagnosis of ovarian agenesis during examination?

<p>Short stature and lack of secondary sexual characteristics.</p> Signup and view all the answers

What is cryptomenorrhoea, and how might it be identified in an examination?

<p>Cryptomenorrhoea is the presence of menstrual-like symptoms without an actual menstrual flow, identified by examining a patent introitus.</p> Signup and view all the answers

What investigations can be performed to assess chromatin status?

<p>A buccal smear and examination of polymorphonuclear leucocytes can determine if chromatin is positive (probably XX) or negative (probably XO or XY).</p> Signup and view all the answers

When is a full chromosome analysis necessary?

<p>A full chromosome analysis may be needed to exclude mosaicism and androgen insensitivity syndrome (AIS).</p> Signup and view all the answers

Which hormonal levels should be investigated for assessing ovarian function?

<p>Hormonal investigations should include LH, FSH, prolactin, oestradiol, and testosterone levels.</p> Signup and view all the answers

What is the significance of ultrasound in this context?

<p>Ultrasound helps determine the presence, state, and size of the ovaries and any follicular activity, as well as assessing uterine size.</p> Signup and view all the answers

What should be done for patients with an absent uterus?

<p>Patients with an absent uterus require special psychological counselling and management in a centre with comprehensive support.</p> Signup and view all the answers

What is the recommended management for girls with an XY karyotype and no uterus?

<p>Careful counselling is necessary due to the malignant potential of their gonads, which may need to be removed.</p> Signup and view all the answers

What is the most common diagnosis when other syndromes are excluded?

<p>The most common diagnosis is constitutional delay.</p> Signup and view all the answers

What surgical intervention is recommended for an imperforate hymen?

<p>A cruciate incision in the hymen allows drainage of retained menstrual blood.</p> Signup and view all the answers

Study Notes

Primary Amenorrhea

  • Primary amenorrhea is the absence of menstruation by age 14 without secondary sexual development or age 16 with secondary sexual development.
  • Primary amenorrhea is classified into two categories: with and without the presence of secondary sexual characteristics.
  • Secondary sexual characteristics refer to the development of breasts, axillary and pubic hair, and growth.

Causes of Primary Amenorrhea

  • With secondary sexual characteristics:
    • Imperforate Hymen

      • Presents as a bulging hymen behind which is a mucocele, the vagina expanded by vaginal secretions of mucus.
      • May also present later in life with cyclical abdominal pain due to dysmenorrhea associated with the accumulation of menstrual blood within the vagina.
    • Transverse Vaginal Septum

      • The vagina fails to cannulate, leading to separate upper and lower parts.
      • Girls present with cyclical abdominal pain due to the development of haematocolpos.
    • Absent Vagina and Functioning Uterus

      • Secondary sexual characteristics are normal, ovarian function is unaffected.
      • Examination of the genital area discloses normal female external genitalia but blind-ending vaginal dimple.
      • Known as Mayer-Rokitansky-Kuster-Hauser (MRKH) syndrome and uterine development is usually absent.
      • Often small uterine remnants (anlage) are found on the lateral pelvic side walls.
      • 40% of these patients have renal anomalies, for example an absent kidney, and skeletal abnormalities.
    • Absent Vagina and Non-Functioning Uterus

      • A rare phenomenon when embryologically the uterine body has developed normally but there is failure of development of the cervix.
      • Leads to failure of the development of the upper vagina.
    • XY Female (Androgen Insensitivity)

      • Structural abnormality of the androgen receptor, due to defects in the androgen receptor gene, which results in a non-functional receptor.
      • Prevents the masculinizing effect of testosterone during normal development.
      • Patients are phenotypically female with normal breasts and external genitalia.
      • Scanty pubic hair, short vagina, absent uterus and tubes, and testes are usually found in the lower abdomen or occasionally in hernial sacs in childhood.
    • Resistant Ovary Syndrome

      • Extremely rare cause of primary amenorrhea.
      • There are elevated levels of gonadotrophin in the presence of apparently normal ovarian tissue.
    • Ovarian Failure

      • May occur as a result of either chemotherapy or radiotherapy for childhood malignancy.
    • Galactosemia

      • This inborn error of galactose metabolism is due to deficiency of galactose-1-phosphate uridyltransferase.
      • Patients have an acute toxic syndrome that causes ovarian cellular destruction thought to be due to the accumulation of galactose-1 -phosphate.
  • Without secondary sexual characteristics:
    • Hypogonadotropic Hypogonadism

      • Congenital:
        • Isolated gonadotrophin-releasing hormone deficiency
        • Olfactogenital syndrome
      • Acquired:
        • Weight loss/anorexia
        • Excessive exercise
        • Hyperprolactinaemia
    • Hypergonadotrophic Hypogonadism

      • Gonadal agenesis
        • XX or XY agenesis
      • Gonadal dysgenesis
        • Turner mosaic
        • Other X deletions or mosaics
      • Ovarian failure
      • Galactosaemia
    • Short Stature

      • Hypogonadotropic Hypogonadism:
        • Hydrocephalus
        • Trauma
        • Empty sella syndrome
        • Tumors
      • Hypergonadotrophic Hypogonadism:
        • Turner syndrome
        • Other X deletions or mosaics

Clinical Approach to Diagnosing Primary Amenorrhea

  • Physical Examination:
    • Evaluates secondary sexual characteristics (breast development, axillary and pubic hair, growth).
    • Breasts are an endogenous assay of estrogen.
    • Presence of breasts indicates adequate estrogen production.
    • Absence of breasts indicates inadequate estrogen exposure.
    • Performs an ultrasound of the pelvis to assess the presence of a normal uterus.
  • Investigations:
    • Buccal smear and an examination of the polymorphonuclear leucocytes to determine if chromatin positive (probably XX) or chromatin negative (probably XO or XY).
    • Full chromosome analysis may be needed to exclude mosaicism and AIS.
    • Hormonal investigations should include LH, FSH, prolactin, oestradiol and testosterone levels.
    • Ultrasound will help determine the presence, state and size of the ovaries and any follicular activity.
    • Uterine size can also be seen.

Management of Primary Amenorrhea

  • Constitutional delay is undoubtedly the most common diagnosis.
  • Patients with an absent uterus require special psychological counselling and their care should be managed in a centre able to offer the complete range of psychological, psychosexual and gynaecological expertise.
  • At the appropriate time a vagina may be created either non-surgically or surgically.
  • In girls found to have an XY karyotype, careful counselling is necessary over the malignant potential of their gonads. Gonads must be removed after counselling is complete.
  • In outflow tract obstruction, surgical management may occur at various levels.
    • Imperforate hymen: a cruciate incision in the hymen allows drainage of the retained menstrual blood.
    • Transverse vaginal septae: require specialist reconstruction to create a vagina.
  • If investigations suggest constitutional delay and development of secondary sexual characteristics is complete, there is no need to suggest any treatment other than annual review.
  • If the diagnosis of resistant ovary syndrome is suspected, then diagnosis can only be made by ovarian biopsy and subsequent histology confirming or illustrating the absence of oocytes.

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Description

This quiz explores the definition and causes of primary amenorrhea, including the distinction between cases with and without secondary sexual characteristics. Key conditions such as imperforate hymen and transverse vaginal septum are also discussed. Test your understanding of this important gynecological topic!

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