Case study in emergency medicine
Topic pneumonia
What is the most likely diagnosis
pneumonia chest X-ray consolidation

This diagnostic image is a posterior-anterior (PA) view chest X-ray demonstrating multifocal pneumonia with prominent consolidations. In the right lung, there is dense consolidation involving the upper lobe, characterized by increased radiopacity that obscures the regional vascular markings. Patchy, ill-defined airspace opacities are also visible extending into the right lower lobe. The left lung field reveals significant consolidation primarily localized within the lower lobe, partially obscuring the left hemidiaphragm silhouette. The cardiac silhouette appears normal in size, and the trachea is midline. The visual findings are consistent with severe pulmonary infection, such as atypical pneumonia (e.g., Legionella species). This clinical imaging serves as an educational example of multifocal bacterial consolidation and its radiographic distribution in the context of acute respiratory distress and sepsis.

A frontal (anteroposterior) chest X-ray demonstrating clinical signs of pneumonia. A prominent blue arrow indicates a large area of increased opacity in the right lower lung field, suggestive of lobar consolidation or a dense pulmonary infiltrate. The opacity is heterogeneous with ill-defined borders, blending into the surrounding parenchyma. Beyond the focal area, there are diffuse bilateral reticulonodular interstitial markings, more pronounced in the mid and lower lung zones. The right costophrenic angle is relatively sharp, while the left shows mild blunting. Several medical devices are present: multiple radiopaque ECG leads/electrodes are positioned on the upper chest and shoulders, and a radiopaque enteric tube (nasogastric or feeding tube) is visible traversing the mediastinum toward the stomach. The image illustrates typical radiological findings of an infectious process in an acute clinical setting, highlighting focal consolidation against a background of generalized pulmonary congestion or inflammation.

This diagnostic image is a posterior-anterior (PA) chest X-ray demonstrating common radiographic features of focal pneumonia. The primary finding is located in the right lung field, where patchy airspace opacities and an area of pulmonary consolidation are visible, highlighted by a blue arrow. The consolidation is characterized by increased density that obscures the underlying pulmonary vasculature, consistent with fluid or inflammatory exudate replacing air in the alveoli. The left lung field appears clear without similar focal opacities. The mediastinal contours, including the cardiac silhouette and trachea, are within normal limits. The costophrenic angles are sharp, suggesting the absence of significant pleural effusion. Bony structures, including the ribs, clavicles, and vertebrae, as well as the surrounding soft tissues, show no acute abnormalities. This image serves as a clinical example of localized infectious process, such as community-acquired pneumonia, in an adult patient.
| Parameter | Finding |
|---|---|
| Temp | 39.8°C (103.6°F) |
| HR | 112 bpm |
| BP | 102/68 mmHg |
| RR | 26 breaths/min |
| SpO2 | 88% on room air |
| GCS | 14 (mildly confused) |

| Clinical Clue | Points To |
|---|---|
| Sudden onset with shaking rigors | Classic pneumococcal feature |
| Rust-colored (blood-tinged) sputum | Pathognomonic for S. pneumoniae |
| Lobar consolidation on CXR (right lower lobe) | Typical for pneumococcal CAP |
| Pleuritic chest pain | Pleural involvement from pneumococcus |
| High fever (39.8°C) with marked leukocytosis | Typical/bacterial rather than atypical |
| Age 68, COPD, DM, unvaccinated | Classic host risk factors |
| Organism | Against it in this case |
|---|---|
| Mycoplasma pneumoniae | "Walking pneumonia" - gradual onset, dry cough, younger patients, interstitial pattern on CXR - not lobar |
| Legionella | No diarrhea/GI symptoms, no water-exposure history, no hyponatremia; Legionella also shows multiple patchy non-segmented infiltrates, not lobar consolidation |
| Klebsiella | More common in alcoholics; "currant jelly" sputum; upper lobe with bulging fissure sign |
| S. aureus | Gradual onset post-viral illness; multilobar patchy infiltrates, abscesses |
| H. influenzae | More insidious; patient already has COPD but basilar patchy (not lobar) pattern |
| PE/CHF | No edema, no DVT risk factors, no bilateral involvement |
| CURB-65 Criterion | This Patient | Points |
|---|---|---|
| Confusion (new) | Yes (GCS 14) | +1 |
| Urea > 7 mmol/L (BUN > 20) | Yes (BUN 32) | +1 |
| Respiratory rate ≥ 30/min | Yes (RR 26 - borderline) | +1 |
| Blood pressure (SBP <90 or DBP <60) | Yes (BP 102/68) | +1 |
| 65 years or older | Yes (68 years) | +1 |