Endometriosis-Related Frozen Pelvis Development and Diagnosis

Mechanism of Frozen Pelvis Development

• Endometriosis causes frozen pelvis through a specific pathophysiologic cascade involving inflammation and fibrosis, leading to scarring, adhesion formation, and anatomic distortion, as supported by the American College of Radiology 1
• The depth of endometriotic lesions extending >5mm below the peritoneal surface (deep infiltrating endometriosis) correlates with severity of adhesions and anatomic distortion, according to Human Reproduction Update 3

Imaging Findings Suggestive of Frozen Pelvis

• MRI is the superior modality for detecting adhesions and frozen pelvis characteristics, including direct adhesion signs, organ fixation, fluid displacement, fibrous masses, and bowel involvement, as recommended by the Journal of the American College of Radiology 4
• Transvaginal ultrasound with expanded protocol can also detect signs of frozen pelvis, though MRI provides superior anatomic detail for surgical planning, as stated by the American College of Radiology 1

Diagnostic Considerations

• Laparoscopy remains the gold standard for definitive diagnosis and staging of endometriosis and frozen pelvis when clinical suspicion is high despite negative imaging, as supported by the American College of Radiology 1