Left lung base nodule elongated at least 1.6x0.8 CM with multiple satellite nodules with reticulonodular densities. Not there on previous scans. Found on ER visit for pain in that area. Significant?

Yes important. Reticule nodular patterns are important for they imply a particular type of infection. You should have this investigated with your primary care doctor.
May bey pneumonia. Without seeing the ct, it is hard to be sure. However, this pattern could be seen with early infection in the lung (pneumonia). Clinical evaluation is needed to make a definitive diagnosis.