Tubo-Ovarian Abscess (TOA) Imaging

Step-by-step decision

Choose step by step as prompted; reaching an endpoint gives the management recommendation. You can go back a step or restart anytime.

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Full pathway

1. [Decision] TVUS preferred; indeterminate → CT
   TVUS appearance / need for CT? (TOA = a severe complication of PID (ascending infection, gonococcus/chlamydia/anaerobes). PID spectrum: salpingitis → pyosalpinx (cogwheel sign + Doppler hyperemia) → tubo-ovarian complex → TOA. Clinically fever + pelvic pain + adnexal mass + purulent discharge.)
   • TVUS typical TOA (complex multiloculated cystic, irregular thick wall, debris/fluid-fluid levels, complex cul-de-sac fluid) → Typical TOA → antibiotics ± drainage
   • Ultrasound indeterminate / suspected GI such as appendicitis / assess extent → Indeterminate → contrast CT
   • Afebrile complex adnexal mass → Afebrile complex mass · suspect malignancy
2. [End] Typical TOA → antibiotics ± drainage
   TVUS typical TOA: IV broad-spectrum antibiotics (cover gonococcus/chlamydia/anaerobes); large (>7 cm) or antibiotic failure → image-guided drainage; rupture/sepsis → emergency surgery; complications infertility/ectopic/chronic pelvic pain.
3. [End] Indeterminate → contrast CT
   Ultrasound indeterminate/suspected GI (appendix/diverticulum)/assess extent: contrast CT (sensitivity 78–100%) — multiloculated septated cystic mass + uniform thick enhancing wall, internal septa, fluid-fluid levels, internal gas (a key feature), fat stranding; the ovarian vein entering the mass helps distinguish it from a periappendiceal abscess.
4. [End] Afebrile complex mass · suspect malignancy
   An afebrile complex adnexal mass should raise suspicion of ovarian malignancy: do not assume TOA; assess by O-RADS ± CA125/MRI, gynecology/gynecologic oncology assessment.

Source guidelines & references

• Pelvic inflammatory disease and tubo-ovarian abscess imaging (Medscape; StatPearls)
• TOA diagnosis and management (Obstet Gynaecol 2018) · source ↗

This pathway is our own synthesis of the decision logic in the guidelines above (not the guideline verbatim); thresholds and workflows change as guidelines update — in practice follow the latest guideline, your institution's protocol and the individual patient.

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