Related Experiment Videos
Abnormal intracerebral thallium localization in a bacterial brain abscess
L Krishna1, W J Slizofski, C D Katsetos
1Department of Radiation Oncology and Nuclear Medicine, Hahnemann University Hospital, Philadelphia, Pennsylvania 19102-1192.
Summary
Thallium-201 scintigraphy can show abnormal uptake in brain lesions. This case highlights that bacterial abscesses, not just tumors, can cause these findings, emphasizing cautious interpretation.
Area of Science:
- Neurology
- Nuclear Medicine
- Infectious Diseases
Background:
- Brain lesions in patients with a history of cancer often raise suspicion for metastasis.
- Thallium-201 (201Tl) scintigraphy is utilized in evaluating brain lesions, sometimes aiding in differentiating tumors from other pathologies.
Observation:
- A 56-year-old male with a history of renal cell carcinoma presented with a solitary brain lesion.
- Initial assessment including MRI and 201Tl-chloride scintigraphy suggested a neoplastic process (primary or metastatic).
- The lesion was ultimately diagnosed as a bacterial abscess upon further investigation.
Findings:
- The bacterial abscess demonstrated moderately intense abnormal localization of 201Tl-chloride.
- Cultures identified Actinomycosis odontolyticus, Peptostreptococcus, and Hemophilus aphrophilus as the causative organisms.
- The imaging characteristics mimicked those typically associated with brain tumors.
Implications:
- This case underscores the importance of considering infectious etiologies, such as bacterial abscesses, in the differential diagnosis of brain lesions, even with suspicious imaging findings.
- It highlights the potential for false positives in neoplastic evaluation when relying solely on thallium scintigraphy.
- Clinicians should exercise caution when interpreting 201Tl brain scintigrams, integrating findings with clinical presentation and other diagnostic modalities.