Inclusion Criteria:  Subjects presenting to the Emergency Department, admitted to the hospital, or seen in the outpatient setting with suspicion of pleural effusion or lung consolidation who received chest imaging to include chest X-ray or CT, or for whom chest X-ray or CT are planned. Suspicion of pleural effusion or lung consolidation may be based upon imaging findings or presentation of symptoms including (but not limited to) dyspnea, hypoxia, tachypnea, rales, or dullness. Adult subjects must be able to be to undergo scanning at least 10/14 lung zones, including including all anterior (1-4) and lateral zones (5-8), and the lowermost posterior zones (11 and 14). Pediatric subjects must be able to undergo scanning in at least 8 lung zones, including all anterior zones (1-4), and the lowermost anterior and posterior zones (6, 8, 10, and 12); see Section 8.1.3 Lung Ultrasound Exams. Subject is willing to provide informed consent (or assent where age appropriate) to participate in the study. Subjects under 18 years of age require informed consent of a parent or guardian and assent as required by institutional IRB. Weight of subject is greater than or equal to 10 kg.  Exclusion Criteria:  Subject has pathology precluding safe and pain-free ultrasound probe placement such as burn, significant soft tissue injury or surgical incisions. Current imprisonment. Prior pleurodesis procedure. Known history of advanced interstitial lung disease (DLCO <50% predicted) Known severe ARDS (per Berlin Oxygenation Criteria8: PaO2/FiO2 < 100) Known history of advanced Chronic Obstructive Pulmonary Syndrome (COPD; GOLD9 Stage 4 for airflow limitation severity defined as FEV1 < 30% of predicted) Known severe restrictive lung disease with baseline FVC < 50% or TLCpleth <50% predicted Presence of subcutaneous air that precludes imaging Body Mass Index (BMI) > 40 Significant scoliosis (Cobb angle ≥ 20 degrees). Pediatric subjects with chronic lung diseases other than asthma. Pediatric subjects on chronic respiratory support (i.e., nasal canula, CPAP, BiPAP, or tracheostomy).