Introduction:
Purulent lobar pneumonia is an inflammation of pulmonary tissue that may progress to parenchymal necrosis and abscess formation. The authors present a case of purulent lobar pneumonia diagnosed using transthoracic lung ultrasound (TLU). Abscess-type lesions had not been visualized in previous computed tomography (CT) scans.

Aim:
To analyze the potential of TLU as a diagnostic tool for purulent lobar pneumonia.

Case study:
A 55-year-old patient with a several-week history of cough, abdominal pain, and diarrhea was admitted to the intensive care unit due to rapidly progressing cardiopulmonary failure. CT revealed merging parenchymal/interstitial densities within the right lung. Broad-spectrum antibiotics were initiated. TLU revealed the presence of lesions characteristic of pneumonia with the development of abscesses and acute respiratory distress syndrome. Despite treatment initiation, the patient’s condition progressively worsened. On the 3rd day of hospitalization, the patient passed away. At autopsy, purulent lobar pneumonia was identified as the direct cause of death.

Results and discussion:
Despite broad and well-documented knowledge regarding its applicability, ultrasound has not been widely used as a diagnostic tool.

Conclusions:
TLU is a safe, repeatable, and inexpensive diagnostic tool. The use of ultrasound in diagnosing pneumonia is well documented, and based on specific diagnostic criteria. As a diagnostic tool for pneumonia, dynamic air bronchogram had a high specificity and positive predictive value. The high sensitivity and specificity of TLU, as pertains to detecting necrosis or abscesses in the course of pneumonia, is comparable with CT. TLU facilitated visualization of small-diameter abscesses.