Yes, endometriosis can absolutely involve the chest—this is called thoracic endometriosis syndrome (TES).
Thoracic endometriosis is a rare but well-recognized extrapelvic manifestation of endometriosis where endometrial-like tissue involves the pleura, diaphragm, lung parenchyma, or airways 1. While endometriosis typically occurs in predictable pelvic locations, the thorax represents the most common site of extragenital disease 2, 3, 4.
Clinical Manifestations
TES presents as four distinct clinical entities:
- Catamenial pneumothorax (most common—occurring within 72 hours of menstruation onset)
- Catamenial hemothorax
- Catamenial hemoptysis
- Pulmonary endometriotic nodules
The key diagnostic feature is the temporal relationship between thoracic symptoms and the menstrual cycle, though symptoms can be nonspecific or even absent 3.
Anatomic Distribution
Diaphragmatic endometriosis is particularly common with TES, with lesions predominantly located in the ventral lateral membrane area (area A) in 100% of cases, followed by adjacent regions 6. The diaphragm shows characteristic morphologic patterns including hiatus lesions, hematomas, and scar tissue—with hiatus lesions being unique to diaphragmatic endometriosis 6.
Diagnostic Approach
Imaging Considerations
The 2024 ACR Appropriateness Criteria specifically mention that expanded protocol imaging should evaluate the diaphragm as part of comprehensive endometriosis assessment 1. However, imaging has significant limitations:
- Chest radiography and CT document acute thoracic events but provide nonspecific findings 2
- MRI with dedicated thoracic protocol offers superior soft tissue characterization, particularly for hemorrhagic and diaphragmatic lesions, using:
- Sagittal and coronal projections (critical for dome-shaped diaphragm visualization)
- T1-weighted fat-suppressed sequences (detect blood products)
- T2-weighted fat-suppressed sequences (identify cystic lesions)
- Breath-hold techniques to minimize motion artifact 3
Critical Diagnostic Framework
Diagnosis requires correlation of imaging findings with menstrual cyclicity, gynecological history, and clinical phenotype—imaging alone is insufficient 2. The diagnostic delay is substantial and clinically significant, often spanning years with profound psychosocial impact 4.
Dry thoracoscopy with biopsy provides definitive histopathological confirmation 5, though surgical visualization of diaphragmatic fenestrations may support the diagnosis even without histologic proof 4.
Clinical Outcomes and Management Implications
The burden of TES is substantial:
- Pneumothorax recurrence rate: 28.2%
- Reoperation rate: 14.0%
- Overall complication rate: 30.8%
- Prolonged air leak: 24.2%
- Average chest tube duration: 4.4 days
- Average hospital stay: 6.1 days
Key Clinical Pitfalls
- Misattribution of cyclic chest symptoms to anxiety or infection leads to years of diagnostic delay 4
- Failure to obtain menstrual history in women presenting with recurrent pneumothorax
- Relying solely on imaging without clinical correlation—imaging findings are temporally variable and nonspecific 2
- Inadequate surgical planning without preoperative imaging assessment of both thoracic and pelvic disease
- Isolated thoracic management without addressing concurrent pelvic endometriosis and hormonal therapy (e.g., Dienogest) 4
The high recurrence and complication rates underscore that TES requires coordinated multidisciplinary management involving gynecology, thoracic surgery, and radiology, with readiness for combined surgical intervention targeting both diaphragmatic surfaces 4, 7.