Imaging of Small Airways Diseases.

Small airways disease, or bronchiolitis, encompasses many conditions that result in bronchiolar inflammation and/or fibrosis. Bronchioles are distal airways within secondary pulmonary lobules that are only visible on imaging when abnormal. High-resolution computed tomography plays an important role in diagnosing small airways disease.

Intimal Problems: A Pictorial Review of Nontraumatic Aortic Disease at Multidetector Computed Tomography.

Nontraumatic aortic diseases include a spectrum of disorders, many of which result in high morbidity and mortality. This article highlights the multidetector computed tomography appearance of common and uncommon nontraumatic aortic entities: dissection, intramural hematoma, penetrating atherosclerotic ulcer, pseudoaneurysm, aneurysm, acute thrombus, chronic occlusion, and vasculitis. Additionally, classical imaging mimics and pitfalls are addressed.

Extrapulmonary small cell carcinoma: imaging features with radiologic-pathologic correlation.

Extrapulmonary small cell carcinoma (EPSCC) refers to small cell carcinoma arising outside of the lungs. EPSCC extrapulmonary small cell carcinoma is a rare aggressive neoplasm, representing a minority of all small cell carcinomas. Despite its uncommon occurrence, EPSCC extrapulmonary small cell carcinoma has been described in nearly every organ, most commonly in the gastrointestinal and genitourinary systems.