Clinical Triage of Massive Pulmonary Embolism Masked by Giant Bullous Disease: The Diagnostic Value of Silent Hypoxia and Physical Examination.

BACKGROUND

Giant bullous disease (GBD) frequently complicates the diagnosis of acute pulmonary embolism (PE) by creating radiographic ambiguity that mimics pneumothorax. In settings where advanced imaging is not immediately available, clinical examination is the primary tool for risk stratification.

CASE PRESENTATION: A 65-year-old female presented with subjective dyspnea. Despite a profound oxygen saturation of 80%, she exhibited a normal respiratory rate and minimal distress, a state known as silent hypoxia. Initial chest X-rays showed a hyperlucent left hemithorax. While this suggested a pneumothorax, the lack of hyper-resonance on percussion pointed toward GBD. Bedside echocardiography confirmed right ventricular strain and a thrombus. Due to the lack of on-site resources, the patient was transferred to a private facility for CT pulmonary angiography (CTPA), confirming a massive PE and a 15-cm giant bulla.

DISCUSSION: This case illustrates how silent hypoxia serves as a physiological red flag for vascular obstruction. By using percussion to rule out pneumothorax, we avoided a potentially fatal chest tube insertion into the bulla. Bedside ultrasound provided the clinical justification for a costly, off-site transfer.

CONCLUSION

Clinical acumen remains the most effective safeguard against iatrogenic injury and diagnostic delay in complex cardiopulmonary cases.