Pelvic inflammatory disease vs Ectopic pregnancy and ovarian torsion
How to tell Pelvic inflammatory disease and Ectopic pregnancy and ovarian torsion apart when a board question makes them look alike.
PID is infectious cervical motion tenderness; ectopic is hCG-positive pregnancy outside uterus; torsion is sudden unilateral ischemic ovary pain.
Side by side
PID causes lower abdominal pain, fever, cervical motion tenderness, adnexal tenderness, mucopurulent discharge, and risk of tubo-ovarian abscess or infertility.
Ectopic pregnancy causes positive pregnancy test with pain and bleeding; ovarian torsion causes sudden severe unilateral pain, nausea, vomiting, and enlarged ovary with reduced flow.
Ascending infection from cervix to uterus, tubes, and pelvis causes inflammation and scarring, commonly involving sexually transmitted pathogens or vaginal flora.
Ectopic implantation grows outside the uterine cavity, often in tube; torsion twists the ovarian vascular pedicle causing ischemia.
Cervical motion tenderness, fever, leukocytosis, GC/CT testing, and pelvic ultrasound for abscess support PID.
Positive hCG without intrauterine pregnancy supports ectopic; Doppler ultrasound with enlarged edematous ovary supports torsion.
The trap
All can cause pelvic pain, so pregnancy test, fever/discharge, and sudden ischemic pain separate them.
The repair move
For acute pelvic pain, start with pregnancy test, then sort infection versus torsion clues.
Try a free question
CoreA 24-year-old sexually active woman has 5 days of lower abdominal pain, dyspareunia, and abnormal vaginal discharge. Temperature 38.4 C. Pelvic exam shows cervical motion tenderness, bilateral adnexal tenderness, and mucopurulent cervical discharge. Beta-hCG is negative. NAAT is positive for Chlamydia trachomatis. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Pelvic inflammatory disease. PID is diagnosed in sexually active women with pelvic pain plus cervical motion tenderness or adnexal tenderness; treatment is empiric ceftriaxone plus doxycycline (plus metronidazole) without waiting for cultures.
Why the other choices are tempting
- B. Ectopic pregnancy requires positive beta-hCG; this patient is negative.
- C. Ovarian torsion produces sudden severe unilateral pain with nausea/vomiting, not bilateral adnexal tenderness with mucopurulent cervix.
- D. Appendicitis localizes to the right lower quadrant with rebound, not bilateral adnexal disease with cervical motion tenderness.
- E. Endometriosis causes cyclic pelvic pain without fever, mucopurulent cervix, or positive STI testing.
Flashcards
Tap a card to flip it.
What exam finding supports PID?
Cervical motion tenderness supports pelvic inflammatory disease.
What first test is crucial in pelvic pain?
Pregnancy testing is crucial in reproductive-age pelvic pain.
Quick answers
What is the fastest way to tell Pelvic inflammatory disease from Ectopic pregnancy and ovarian torsion?
PID is infectious cervical motion tenderness; ectopic is hCG-positive pregnancy outside uterus; torsion is sudden unilateral ischemic ovary pain.
What is the key clue for Pelvic inflammatory disease?
PID causes lower abdominal pain, fever, cervical motion tenderness, adnexal tenderness, mucopurulent discharge, and risk of tubo-ovarian abscess or infertility.
What is the key clue for Ectopic pregnancy and ovarian torsion?
Ectopic pregnancy causes positive pregnancy test with pain and bleeding; ovarian torsion causes sudden severe unilateral pain, nausea, vomiting, and enlarged ovary with reduced flow.
What is the common trap with Pelvic inflammatory disease vs Ectopic pregnancy and ovarian torsion?
All can cause pelvic pain, so pregnancy test, fever/discharge, and sudden ischemic pain separate them.