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Pneumonia can cause 111indium octreotide uptake
1Department of Nuclear Medicine and Ultrasound, Westmead Hospital, Wentworthville, NSW, Australia.
Australasian Radiology
|May 31, 2006
Summary
An indium-111 octreotide scan suggested a lung abnormality, but symptoms and imaging confirmed community-acquired pneumonia. Correlating scan findings with clinical presentation is crucial to prevent misdiagnosis.
Area of Science:
- Nuclear medicine imaging
- Diagnostic radiology
- Infectious disease diagnosis
Background:
- Indium-111 octreotide scans are used for detecting neuroendocrine tumors like insulinoma.
- Radiopharmaceutical uptake in non-target organs can occur and may mimic pathology.
Observation:
- An 18-year-old woman presented with symptoms suggestive of insulinoma, undergoing an indium-111 octreotide scan.
- The scan revealed increased radiotracer uptake at the right lung base.
- The patient simultaneously reported a productive cough, and chest X-ray showed right lower lobe opacification.
Findings:
- The lung opacification and octreotide uptake resolved after antibiotic treatment for community-acquired pneumonia.
- This indicated the uptake was a false positive, likely due to inflammatory processes.
Implications:
- Clinical correlation is essential when interpreting octreotide scans to avoid misinterpreting inflammatory changes as neoplastic lesions.
- This case highlights the importance of integrating imaging findings with patient symptoms and clinical context for accurate diagnosis.