I'm a bit worriedI've taken my mom, who's 61, to the hospital for some stomach issues. The doctor there suggested a CT scan of her chest and abdomen, and she ended up with a CORADS 4 result. Then they did an RT-PCR test, but that came back negative for COVID-19. She doesn't show any symptoms like cough, cold, or fever. Today, they went ahead with a chest X-ray, and now they're saying she has increased bronchovascular markings. Could you explain what that means? Does it suggest she might have COVID, even if the test was negative?