Emergency Medicine Hub / Pediatrics & Obstetrics • 3 min read • 2 sections

Acute Pelvic Pain & Ovarian Torsion

Comprehensive emergency evaluation and protocolized surgical decision-making for acute gynecologic pelvic emergencies: Ovarian/Adnexal Torsion (twisting of ovary and fallopian tube around the infundibulopelvic and utero-ovarian ligaments, venous congestion, hemorrhagic infarction, mature cystic teratomas/dermoids > 5 cm as primary risk factor), transvaginal Doppler ultrasound findings and the CRITICAL 'NORMAL DOPPLER FLOW' FALLACY (normal arterial flow is present in up to 30–50% of confirmed torsions due to dual ovarian blood supply), clinical presentation (sudden paroxysmal severe unilateral lower abdominal pain with prominent nausea/vomiting), and emergent diagnostic laparoscopy.

Resuscitation Quick Actions • First 2 Minutes

High-Acuity

Normal Doppler Trap

CRITICAL: Normal Doppler arterial blood flow DOES NOT rule out ovarian torsion; present in 30–50% of confirmed cases! (Dual blood supply)

Dermoid/Cyst > 5 cm

Ovarian mass or cyst > 5 cm (mature cystic teratoma/dermoid) is the #1 risk factor for torsion due to mechanical weight and mobility

Diagnostic Ultrasound Signs

Enlarged ovary (> 4 cm or volume > 20 mL), peripheralized follicles ('string of pearls' appearance from edema), and the 'whirlpool sign'

Whirlpool Sign

Twisted vascular pedicle visible on grayscale and color Doppler in the adnexa; pathognomonic for adnexal torsion

Laparoscopic Detorsion

Emergent laparoscopy: untwist the ovary regardless of blue/black appearance; modern evidence shows > 90% regain functional follicular activity

Rule Out Ectopic First

MANDATORY STAT URINE/SERUM HCG: any reproductive-age female with pelvic pain must have pregnancy ruled out immediately

Mastitis

Postpartum breast infection (Staph aureus); warm, tender, erythematous breast wedge; continue breastfeeding or pumping, treat with Dicloxacillin (500 mg PO QID) or Cephalexin; ultrasound to rule out breast abscess.

Word Catheter Placement

Treatment of choice for symptomatic Bartholin gland abscess; make small stab incision, express purulence, insert Word catheter, and inflate balloon with 3-4 mL sterile saline (NOT air); leave in place for 4-6 weeks to epithelial tract.

Bottom-Line Clinical Pearl

Ovarian torsion is a time-critical surgical emergency where the ovary twists on its ligamentous pedicle, occluding venous and lymphatic drainage, producing massive ovarian enlargement and eventual arterial thrombosis and necrosis. The single most dangerous trap in emergency medicine is the 'NORMAL DOPPLER ULTRASOUND' FALLACY: the presence of normal arterial Doppler flow DOES NOT rule out ovarian torsion! Dual blood supply from the ovarian artery and the uterine artery allows arterial inflow to persist long after low-pressure venous outflow is completely occluded. Up to 30% to 50% of surgically confirmed ovarian torsions have documented normal Doppler arterial waveforms on ultrasound. If a patient presents with sudden severe unilateral pelvic pain, nausea/vomiting, and a pelvic mass (> 5 cm, e.g., dermoid cyst), EMERGENT GYNECOLOGIC CONSULTATION FOR DIAGNOSTIC LAPAROSCOPY IS MANDATORY regardless of ultrasound Doppler reports.

1. Pathophysiology & Ligamentous Anatomy

The ovary is suspended in the pelvis by two vascular pedicles: (1) The infundibulopelvic (suspensory) ligament, which carries the primary ovarian artery and vein directly from the aorta and IVC/renal vein, and (2) The utero-ovarian ligament, which connects the medial pole of the ovary to the uterine cornu and carries the ovarian branch of the uterine artery.

Ovarian torsion occurs when the ovary twists around both ligaments. An underlying adnexal mass—most commonly a benign mature cystic teratoma (dermoid cyst) or large corpus luteum cyst measuring 5 to 10 cm—acts as a heavy mechanical pivot. Torsion first collapses thin-walled, low-pressure venous and lymphatic vessels. Continued high-pressure arterial inflow creates massive intra-ovarian edema, capsular stretching (intense pain), and internal parenchymal hemorrhage, eventually thrombosing the feeding arteries and producing irreversible hemorrhagic necrosis.

2. The 'Normal Doppler' Fallacy & Ultrasound Features

Ultrasound Finding	Pathophysiologic Basis	Diagnostic Value & Traps
Enlarged Ovarian Stroma (> 4 cm/Volume > 20 mL)	Massive stromal edema and venous engorgement	Most sensitive ultrasound finding (> 90%). An ovary that is normal in size and symmetric with the contralateral side makes torsion extraordinarily unlikely.
Peripherally Displaced Follicles ('String of Pearls')	Massive central stromal edema mechanically pushes developing antral follicles to the outer cortical periphery	High specificity for adnexal torsion.
The 'Whirlpool Sign'	Direct visualization of the coiled, twisted vascular pedicle in the broad ligament	Virtually 100% pathognomonic for torsion when visualized on color Doppler.
Presence of Normal Arterial Doppler Flow	Dual arterial supply (ovarian artery + uterine artery anastomosis) and intermittent/partial torsion	THE ULTIMATE DIAGNOSTIC TRAP! Normal arterial waveforms are present in 30% to 50% of confirmed cases. NEVER use normal Doppler flow to rule out torsion in a patient with an enlarged ovary and severe pain!

Critical Pitfall / Contraindication

DETORSION VS. OOPHORECTOMY: Modern gynecological practice dictates that even a severely enlarged, black, or bluish-purple ovary must be UNTWISTED (laparoscopic detorsion) and preserved in reproductive-age females. Studies demonstrate that over 90% of necrotic-appearing ovaries regain normal follicular activity and endocrine function over subsequent months. Oophorectomy is reserved only for frank peritonitis, structural gangrene that disintegrates upon handling, or postmenopausal women.

Board & Shelf Drill 5 Questions • Untimed Tutor Mode

Test Your Acute Pelvic Pain & Ovarian Torsion Clinical Acumen

Directly launch an active-recall practice block from our 8,400+ validated COMLEX Level 1, 2-CE & 3 board question bank with complete explanations.

Related Emergency Protocols & Differentials

Related EM Protocol