08/05/2026
🚨 RIF Pain in a 14-Year-Old — Don’t Overcall What You Don’t See
A 14-year-old girl presents with right iliac fossa pain.
Recently started menstruating. Pain is recurrent and cyclical.
🖥️ Ultrasound Findings:
• Endometrium: 9.3 mm
• Mild free fluid in pouch of Douglas (POD)
• No adnexal mass
• Echogenic floaters in urinary bladder
🧠 The Trap Most People Fall Into
You see:
• Free fluid → “?PID”
• Bladder echoes → “UTI”
👉 And suddenly the report becomes a list of diseases instead of a diagnosis
🎯 What This Actually Is
👉 Mittelschmerz (Ovulation Pain)
Why?
• Mid-cycle timing ✔️
• Unilateral recurrent pain ✔️
• Simple POD fluid ✔️
• Adolescent with new cycles ✔️
💡 This is physiological — not pathology
🔍 Let’s Break It Down Properly
1️⃣ Free Fluid in POD
✔️ Small, simple fluid in this context =
👉 Ovulatory follicular rupture
❌ Not PID
(PID shows complex fluid, inflamed tubes, TO mass)
2️⃣ Echogenic Floaters in Bladder
✔️ Nonspecific finding:
• Debris
• Concentrated urine
• Pus
• Blood
👉 Ultrasound cannot diagnose UTI
✔️ Correct approach:
“Correlate with urinalysis”
❌ Wrong approach:
“Features of UTI”
📌 The Report That Shows You’re Senior
Mild free fluid in the pouch of Douglas, likely physiological (ovulatory).
Low-level echoes within the urinary bladder may represent debris; correlation with urinalysis is advised.
No sonographic features of pelvic inflammatory disease.
⚠️ The Real Lesson
👉 Not every finding deserves a differential list
If you:
• Overcall → you trigger unnecessary treatment
• Underthink → you miss the diagnosis
• Scatter differentials → you lose clinical trust
🧠 Radiology Wisdom
✔️ Call what is most likely
✔️ Support it with clinical timing
✔️ Exclude what is dangerous but unsupported
🔥 Takeaway Rule
• Simple POD fluid + mid-cycle pain → Think ovulation first
• Bladder echoes → Correlate, don’t conclude
• PID → Only if you SEE inflammation
Radiology is not about describing everything.
👉 It’s about knowing what matters — and what doesn’t.
Credit: IJ okankwo
