biology

Imperforate hymen

Imperforate hymen is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Imperforate hymen rather than just read about it. In short: An imperforate hymen is a congenital disorder where a hymen without an opening completely obstructs the vagina. It is caused by a failure of the hymen to perforate during fetal development.

Key takeaways

Imperforate hymen belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Imperforate hymen to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Imperforate hymen from memory before moving on to harder problems.

Reference excerpt

An imperforate hymen is a congenital disorder where a hymen without an opening completely obstructs the vagina. It is caused by a failure of the hymen to perforate during fetal development. It is most often diagnosed in adolescent girls when menstrual blood accumulates in the vagina and sometimes also in the uterus. It is treated by surgical incision of the hymen.

Signs and symptoms Affected newborns may present with acute urinary retention. In adolescent females, the most common symptoms of an imperforate hymen are cyclic pelvic pain and amenorrhea; other symptoms associated with hematocolpos include urinary retention, constipation, low back pain, nausea, and diarrhea. Other vaginal anomalies can have similar symptoms to an imperforate hymen. Vaginal atresia and a transverse vaginal septum require differentiation. A strong urge to defecate has been observed in a few women.

Complications If untreated or unrecognized before puberty, an imperforate hymen can lead to peritonitis or endometriosis due to retrograde bleeding. Additionally, it can lead to mucometrocolpos (dilatation of the vaginal canal and uterus due to mucus buildup) or hematometrocolpos (dilatation due to a buildup of menstrual fluid). Mucometrocolpos and hematocolpos can in turn cause urinary retention, constipation, and urinary tract infection.

Pathophysiology An imperforate hymen is formed during fetal development when the sinovaginal bulbs fail to canalize with the rest of the vagina. Although some instances of familial occurrence have been reported, the condition's occurrence is mostly sporadic, and no genetic markers or mutations have been linked to its cause.

Diagnosis An imperforate hymen is most often diagnosed in adolescent girls after the age of menarche with otherwise normal development. In adolescent girls of menarcheal age, the typical presentation of the condition is amennorhea and cyclic pelvic pain, indicative of hematocolpos secondary to vaginal obstruction. An imperforate hymen is usually visible on vaginal inspection as a bulging blue membrane. If hematocolpos is present, a mass is often palpable on abdominal or rectal examination. The diagnosis of an imperforate hymen is usually made based purely on the physical exam, although if necessary the diagnosis can be confirmed by transabdominal, transperineal or transrectal ultrasound. An imperforate hymen can also be diagnosed in newborn babies and it is occasionally detected on ultrasound scans of the foetus during pregnancy. In newborns the diagnosis is based on the findings of an abdominal or pelvic mass or a bulging hymen. Examination of the normal neonatal vagina usually reveals a track of mucus at the posterior commissure of the labia majora; an absence of mucus may indicate an imperforate hymen or another vaginal obstruction. A similar condition, cribriform hymen, is diagnosed when the hymen contains many minute openings.

Management Before surgical intervention in adolescents, symptoms can be relieved by the combined oral contraceptive pill taken continuously to suppress the menstrual cycle or NSAIDs to relieve pain. Surgical treatment of the imperforate hymen by hymenotomy typically involves making cruciate incisions of the hymen, excising segments of hymen from their bases, and draining the vaginal canal and uterus. For affected girls who wish (or whose parents wish) to have their hymens preserved, surgical techniques to excise of a central flange of the hymen can be used. The timing of surgical hymen repair is controversial: some doctors believe it is best to intervene immediately after the neonatal period, while others believe that surgical repair should be delayed until puberty, when estrogenization is complete.

Epidemiology Imperforate hymen is the most common vaginal obstruction of congenital origin. Estimates of the frequency of imperforate hymen vary from 1 in 1,000 to 1 in 10,000 females.

References

Glavan, N; Haller, H; Brnčić-Fischer, A; Glavan-Gačanin, L; Miletić, D; Jonjić, N (2016). "Imperforate hymen presenting as vaginal cyst in a 16-month-old child - considerations for an early diagnosis". Scottish Medical Journal. 61 (1): 48–50. doi:10.1177/0036933015615263. PMID 26659454. S2CID 27077599. Imperforate hymen at Medscape

External links

Illustrations

Worked examples

Example 1 — a first encounter with Imperforate hymen

Start with the simplest possible case. Write down what Imperforate hymen claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Imperforate hymen before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Imperforate hymen ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Imperforate hymen

In research: Imperforate hymen appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Imperforate hymen in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Imperforate hymen is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomical pathology, Congenital disorders of female genital organs, Hymen, so understanding it makes those chapters shorter.
In everyday life: Look for Imperforate hymen outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Imperforate hymen in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Imperforate hymen means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Imperforate hymen out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Imperforate hymen in simple terms?

An imperforate hymen is a congenital disorder where a hymen without an opening completely obstructs the vagina. It is caused by a failure of the hymen to perforate during fetal development.

Why does Imperforate hymen matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Imperforate hymen?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Imperforate hymen.