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Thallium-201 Accumulation by Epidermoid Inclusion Cyst

Radiology Service (114), Veterans Affairs Medical Center, University of Texas, Southwestern Medical Center, Dallas, Texas

Correspondence: For reprints contact: R. Paul Bordlee, MD, Radiology Services, Veterans Affairs Medical Center, University of Texas, Southwestern Medical Center, 4500 S. Lancaster Rd., Dallas, TX 75216.

ABSTRACT

An elderly male undergoing re-evaluation for coronary artery disease demonstrated an extra-cardiac focus of ²⁰¹Tl accumulation during the performance of a planer myocardial perfusion scan. This corresponded to a subcutaneous lesion of the left posterior thorax found on a concurrent computerized axial tomographic (CAT) scan and upon surgical excision proved to be an "epidermoid inclusion cyst." A follow-up nuclear scan failed to reveal any residual extracardiac tracer localization. Confusing this lesion with metastatic deposits during ²⁰¹Tl neoplastic evaluations can be avoided by examination of the adjacent integument.