Clinical Insight: Sudden Dyspnea
A short image-based case built to test whether you can connect acute pleuritic symptoms, asymmetric breath sounds, and chest x-ray clues.
A 24-year-old man presents to the emergency department with sudden-onset right-sided pleuritic chest pain and shortness of breath that began while he was walking to class. He has no fever, cough, leg swelling, or recent surgery. He is 6 feet 4 inches tall, weighs 148 lb (67 kg), and has a BMI of 18 kg/m². Physical examination shows decreased breath sounds over the right upper lung field and mild tachypnea.
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Diagnosis: Spontaneous pneumothorax
The clinical presentation is most consistent with spontaneous pneumothorax. The diagnosis is supported by sudden pleuritic chest pain, dyspnea, decreased unilateral breath sounds, and chest x-ray findings such as a visible pleural line with decreased peripheral lung markings. A tall, thin young adult is a classic risk profile for primary spontaneous pneumothorax.
- Key clue: abrupt unilateral pleuritic chest pain with decreased breath sounds points strongly toward pneumothorax.
- Imaging clue: a pleural line with absent peripheral vascular markings supports the diagnosis.
- Management connection: observation, oxygen, aspiration, or chest tube placement depends on size and clinical stability.
- Do not miss: hypotension, severe hypoxia, tracheal deviation, or distended neck veins suggest tension physiology and require emergent decompression.
References
- 1. Chapter 135: Pulmonary Thromboembolism and Deep-Vein Thrombosis. In: Kasper DLD, Fauci ASA, Hauser SLS, et al, eds. Harrison's Manual of Medicine. McGraw Hill Inc.; 2020. https://harrisons.unboundmedicine.com/harrisons/view/Harrisons-Manual-of-Medicine/623049/all/. Accessed October 11, 2024.
- 2. Weinberg AS, Rali P. Acute pulmonary embolism in adults: Treatment overview and prognosis. In: Mandel J, Zachrison KS, eds. UpToDate. Li H, Finlay G, eds. Waltham, MA: UpToDate Inc. https://www.uptodate.com. Accessed August 9, 2025.
- 3. Reyes LF, Conway Morris A, Serrano-Mayorga C, Derde LPG, Dickson RP, Martin-Loeches I. Community-acquired pneumonia. Lancet. 2025;406(10517):2371-2388. doi:10.1016/S0140-6736(25)01493-X. Accessed January 2, 2026.
- 4. Iqbal B, Hallifax R, Rahman NM. Pneumothorax: An update on clinical spectrum, diagnosis and management. Clin Med (Lond). 2025;25(3):100327. doi:10.1016/j.clinme.2025.100327. Accessed August 2, 2025.
- 5. Dad T, Sarnak MJ. Pericarditis and Pericardial Effusions in End-Stage Renal Disease. Semin Dial. 2016;29(5):366-373. doi:10.1111/sdi.12517. Accessed June 20, 2025.
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