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Nonembolic high-probability perfusion lung scan for pulmonary thromboembolism
J Martino1, J Allende, A Herrero
1Department of Emergency Medicine, Hospital Central de Asturias, Oviedo, Spain.
The American Journal of Emergency Medicine
|November 1, 1994
Summary
Diagnosing pulmonary thromboembolism (PTE) can be challenging. Perfusion lung scans help rule out PTE, but this case highlights how lung cancer can mimic PTE on scans, requiring careful interpretation.
Area of Science:
- Nuclear Medicine
- Diagnostic Imaging
- Pulmonology
Background:
- Pulmonary thromboembolism (PTE) diagnosis is challenging in emergency settings.
- Perfusion lung scans are crucial for ruling out significant PTE.
- False-positive scans can create diagnostic dilemmas.
Observation:
- Bronchogenic carcinoma can involve pulmonary arteries, mimicking PTE.
- Scintigraphic imaging characteristics may suggest nonembolic origins of perfusion defects.
- A case of small-cell lung cancer involving the left pulmonary artery presented with symptoms suggestive of PTE.
Findings:
- The study reviews the "stripe sign" in perfusion lung scans.
- Differential diagnosis clues for massive, unilateral perfusion defects are discussed.
- Distinguishing lung cancer from PTE on perfusion scans is critical.
Implications:
- Accurate interpretation of perfusion lung scans is vital for correct PTE diagnosis.
- Awareness of nonembolic causes of perfusion defects improves diagnostic accuracy.
- This case emphasizes the need to consider malignancy in PTE differential diagnosis.