Reproductive - FA Patho p624 - 639 Flashcards
(123 cards)
tall, long extremities, gynecomastia, female hair distribution
Klinefelter syndrome
Which sex chr disorder will have presence of inactive Barr body?
Klinefelter syndrome
Which hormones are inc in both Klinefelter’s and Turners?
Both FSH and LH
Klinefelter -
Dysgenesis of seminiferous tubules --\> dec inhibin B --\> inc FSH Abnormal leydig (dec testosterone = inc LH, inc estrogen)
Turners - dec estrogen –> inc LH, FSH
What are sx of Turners?
- Short stature (if untreated; preventable with growth hormone therapy)
- ovarian dysgenesis (streak ovary),
- shield chest
- bicuspid aortic valve, coarctation (femoral < brachial pulse),
- lymphatic defects (result in webbed neck or cystic hygroma; lymphedema in feet, hands),
- horseshoe kidney,
- high-arched palate,
- shortened 4th metacarpals.
How is the sex chromosome lost in Turner?
nondisjunction during meiosis or mitosis.
Explain the meiosis and mitosis errors that can happen in Turner
Meiosis errors usually occur in paternal gametes –> sperm missing the sex chromosome.
Mitosis errors occur after zygote formation –> loss of sex chromosome in some but not all cells –> mosaic karyotype (eg. 45,X/46XX). (45,X/46,XY)
How is pregnancy possible in Turners?
Pregnancy is possible in some cases (IVF, exogenous estradiol-17β and progesterone).
Which disease is assoc with cystic hygroma?
Turner’s (lymph defects)
What sexual chr disorder can present with dec femoral pulse vs brachial?
Turners - due to coractation.
May be associated with severe acne, learning disability, autism spectrum disorders.
Double Y males
Both ovarian and testicular tissue present (ovotestis); More likely to be xx or xy?
46,XX > 46,XY.
in primary hypogonadism what will be the testosterone, LH level?
low test, high LH
in testosterone secreting tumor, what will be the testosterone, LH lever?
high testosterone, low LH
in defective androgen receptor, what will be testosterone, LH level?
high test, high LH
Sx of 46, XX DSD and cause?
Ovaries present, but external genitalia are virilized or ambiguous.
Due to excessive and inappropriate exposure to androgenic steroids during early gestation (eg, congenital adrenal hyperplasia or exogenous administration of androgens during pregnancy).
46, XY DSD sx and most common cause?
Testes present, but external genitalia are female or ambiguous.
Most common form is androgen insensitivity syndrome (testicular feminization).
dx? masculinized female infant (46, XX), mother had inc serum testosterone and hirsutism
Placental aromatase def
Why does pregnant mother with placental aromatase def present with virilization?
Fetal androgens cross the placenta
Normal appearing female, female ext genetalia but minimal axillary and pubic hair, blind sac vagina with no uterus and fallopian tubes
Androgen insensitivity syndrome, defect in androgen receptor.
In Androgen Insensitivity syndrome, if some one has normal functioning testes, where found and what to do?
labia majora, removed surgically to (-) malignancy
dx? no prostate, normal testosterone/estrogen, internal genitalia normal, but ambiguous external genitalia, 46 XY
5 alpha reductase def
in 5 alpha reductase def, why do you see ambiguous external genitalia and no prostate?
b/c DHT made from testosterone by 5 alpha reductase converts genital tubercle, urogenital sinus into male external genitalia, prostate
Hormone levels in 5α-reductase deficiency
Testosterone/estrogen levels are normal; LH is normal or inc.