Isolated pulmonary Takayasu arteritis: clinicopathologic characteristics

Area of Science:

• Vascular Pathology
• Rheumatology
• Pulmonary Medicine

Background:

• Systemic Takayasu arteritis commonly affects pulmonary arteries, usually diagnosed clinically and angiographically.
• Isolated pulmonary Takayasu arteritis is rare and requires histological confirmation.
• Previous diagnoses in affected patients included thromboembolism, pulmonary hypertension, granulomatosis, tumor, or sarcoidosis.

Purpose of the Study:

• To describe the clinical and histopathological features of isolated pulmonary Takayasu arteritis.
• To highlight the distinctiveness of pulmonary Takayasu arteritis from its systemic counterpart and other pulmonary conditions.

Main Methods:

• Retrospective analysis of five patients diagnosed with isolated pulmonary Takayasu arteritis.
• Surgical specimens from lung resection or arterial reconstruction/bypass were examined histopathologically.

Main Results:

• Five patients (2 men, 3 women; age 25-66) were identified.
• Histopathology revealed three types of vascular lesions: granulomatous giant cell arteritis, organized thrombus with recanalization/neoangiogenesis, and plexogenic arteriopathy.
• These findings were distinct from systemic Takayasu arteritis and other pulmonary diseases like pulmonary hypertension and sarcoidosis.

Conclusions:

• Histopathological examination is crucial for diagnosing isolated pulmonary Takayasu arteritis.
• Pulmonary Takayasu arteritis exhibits unique vascular lesions differentiating it from systemic forms and other pulmonary vasculitides.
• The distinct histopathology aids in distinguishing pulmonary Takayasu arteritis from conditions mimicking it.