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False-positive radiocolloid liver image due to a subphrenic abscess
Clinical Nuclear Medicine
|June 1, 1986
Summary
False-positive liver scans can mislead diagnosis. This case highlights how a subphrenic abscess mimicked a liver defect on radiocolloid imaging, emphasizing the need for cross-sectional imaging.
Area of Science:
- Nuclear Medicine
- Diagnostic Imaging
- Abdominal Surgery
Background:
- Radiocolloid liver imaging is a common diagnostic tool.
- Extrinsic lesions can cause false-positive findings, mimicking intrahepatic pathology.
- Accurate interpretation requires consideration of adjacent anatomical structures.
Observation:
- A patient presented with an apparent photopenic (cold) area on liver scintigraphy.
- Abdominal computed tomography (CT) revealed a low-density lesion anterior to the liver.
- Surgical exploration confirmed the lesion as a right anterior subphrenic abscess.
Findings:
- The subphrenic abscess, an extrinsic structure, was misinterpreted as an intrahepatic defect on the initial liver scan.
- Computed tomography (CT) provided crucial anatomical detail to differentiate the extrinsic lesion from true liver pathology.
- Histopathological confirmation validated the CT findings and the nature of the abscess.
Implications:
- This case underscores the importance of correlating scintigraphic findings with cross-sectional imaging modalities like CT for accurate diagnosis.
- Recognizing potential sources of extrinsic artifact in liver imaging is critical for avoiding misdiagnosis and unnecessary interventions.
- Subphrenic abscesses should be considered in the differential diagnosis of apparent liver defects, especially when CT suggests an extrahepatic origin.