Amenorrhea: Pathology Review

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Amenorrhea: Pathology Review


Female reproductive system disorders


Fibrocystic breast changes

Intraductal papilloma

Phyllodes tumor

Paget disease of the breast

Breast cancer

Breast cancer: Pathology review

Benign breast conditions: Pathology review



Potter sequence

Intrauterine growth restriction

Preterm labor

Postpartum hemorrhage


Amenorrhea: Pathology Review

Pelvic inflammatory disease


Sexually transmitted infections: Vaginitis and cervicitis: Pathology review


Gestational trophoblastic disease

Ectopic pregnancy

Ovarian cyst

Premature ovarian failure

Polycystic ovary syndrome

Ovarian torsion

Krukenberg tumor

Sex cord-gonadal stromal tumor

Surface epithelial-stromal tumor

Germ cell ovarian tumor

Ovarian cysts and tumors: Pathology review


Congenital toxoplasmosis

Congenital cytomegalovirus (NORD)

Congenital syphilis

Neonatal conjunctivitis

Neonatal herpes simplex

Congenital rubella syndrome

Neonatal sepsis

Neonatal meningitis

Congenital TORCH infections: Pathology review

Hyperemesis gravidarum

Gestational hypertension

Preeclampsia & eclampsia

Gestational diabetes

Cervical incompetence

Placenta previa

Placenta accreta

Placental abruption

Complications during pregnancy: Pathology review

Female sexual interest and arousal disorder

Orgasmic dysfunction

Genito-pelvic pain and penetration disorder

Fetal hydantoin syndrome

Fetal alcohol syndrome

Uterine fibroid



Endometrial hyperplasia

Endometrial cancer

Uterine disorders: Pathology review


Cervical cancer

Cervical cancer: Pathology review

Vaginal and vulvar disorders: Pathology review


Amenorrhea: Pathology Review

USMLE® Step 1 questions

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USMLE® Step 1 style questions USMLE

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A 35-year-old woman comes to the office with complaints of irregular menstruation. She has had only two periods in the last year. Menarche was at age 12, and she had a regular menstrual cycle until 12 months ago. The patient also reports feeling flushed at night without provocation and experiencing occasional dyspareunia with post-coital spotting. Past medical history is noncontributory. Temperature is 36.9°C (98.5°F), pulse is 70/min, respirations are 13/min, and blood pressure is 118/76 mmHg. Cardiopulmonary and abdominal exams are unremarkable. The patient has Tanner stage V breasts and pubic hair. Pelvic examination reveals a small anteverted uterus and minimal vaginal rugations. Abdominal examination is within normal limits. Urine pregnancy test is negative. Serum TSH is 3.2 µU/mL. Which of the following set of hormonal changes will most likely be observed in this patient?


Two people come to the clinic one day. First you see Ana, a 17 year old teenage girl. Ana comes with her mother, who’s worried because Ana hasn’t had her first period yet.

Upon physical examination, you notice that Ana is quite short for her age. In addition, she has a wide neck, broad chest, and poorly developed breasts with widely spaced nipples. You decide to perform a blood test, which reveals low estrogen levels and high FSH and LH.

Next, comes María, a 25 year old female who’s concerned because she hasn’t had her period for nine months now.

She’s sexually active, so the first thing you do is ask for a pregnancy test, which comes up negative.

When asked about physical activities, she refers to going for a 2-hour run every single day, plus swimming and then tennis on weekdays.

Regarding her diet, she’s very strict when it comes to avoiding fatty foods. On physical examination, you realize that María is underweight, and a blood test reveals low levels of estrogen, LH, and FSH.

Okay, now both Ana and María have amenorrhea, which is generally defined as the absence of menstruation in females of reproductive age.

Now, for menstruation to happen, an individual must have a regular female reproductive anatomy and sexual development, which is normally under control of the hypothalamic-pituitary-gonadal axis.

First, the hypothalamus secretes gonadotropin-releasing hormone, or GnRH for short, which goes to the anterior pituitary to stimulate the release of gonadotropic hormones, which are luteinizing hormone or LH, and follicle-stimulating hormone or FSH.

LH and FSH then stimulate the gonads to produce sex hormones; in females, LH and FSH stimulate the ovaries to secrete estrogen and progesterone, which are responsible for the female primary sexual characteristics.

These are the changes necessary for reproduction, including menstruation, ovulation, and uterine development.


Amenorrhea is the absence of menstrual periods in a woman of reproductive age. There are two types of amenorrhea: primary and secondary. Primary amenorrhea is defined as the failure to achieve menarche by age 16 in the absence of any secondary sexual characteristics, or by 14 if there are secondary sexual characteristics present. Secondary amenorrhea is defined as a cessation of menses for 3 months in a woman with previously established normal menstrual cycles.


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