Final answer:
Perihilar streaking with fluid in the fissures on CXR is a finding associated with congestive heart failure (CHF). It is not normal, nor does it indicate pneumonia or lung cancer.
Step-by-step explanation:
Perihilar streaking on chest X-ray (CXR) with fluid in the fissures is a finding associated with congestive heart failure (CHF). It is not a normal finding in healthy individuals, nor is it indicative of pneumonia or lung cancer. In CHF, the heart's inability to pump blood efficiently causes fluid build-up in the lungs, leading to fluid in the fissures and streaking on the CXR. This finding can help physicians differentiate between pneumonia and CHF as the cause of symptoms such as shortness of breath and crackling sounds on auscultation.