Why is diaphragmatic endometriosis often found only during surgery?

Diaphragmatic endometriosis is frequently missed before surgery because it sits outside the typical pelvic areas that most exams and standard imaging focus on. Even high-quality ultrasound or MRI doesn’t give a simple yes-or-no answer: some lesions are small, superficial, or positioned in ways that make them hard to visualize, and some people have little to no diaphragm-specific symptoms. When symptoms do occur, they’re often mistaken for non-gynecologic issues unless the timing is clearly cyclical (for example, right upper abdominal, chest, or shoulder-tip pain that flares around periods).

Surgery is often when it’s finally identified because minimally invasive laparoscopy or robotic surgery allows direct inspection of the diaphragm, which can reveal implants that scans and routine pelvic evaluation miss. This is also why surgical planning matters: diaphragm excision requires specific skill and careful decision-making, since the diaphragm is thin and disease can, in rarer cases, extend toward the chest. If your diaphragm endometriosis wasn’t recognized until surgery, it doesn’t mean it wasn’t real earlier; it usually reflects the limits of pre-op testing and how easily this location can be overlooked. If you’re still having cyclical chest, shoulder, or rib pain or breathing-related flares, our team can help review your history, imaging, and operative findings and plan next steps with the right expertise in place.