Abnormal Tl-201 limb scan due to unilateral tremor

Area of Science:

• Nuclear medicine
• Medical imaging
• Neurology

Background:

• Thallium-201 (Tl-201) scintigraphy is utilized for assessing myocardial perfusion and evaluating various other conditions.
• Limb scintigraphy with Tl-201 can sometimes reveal unexpected distribution patterns.
• The interpretation of these patterns typically focuses on perfusion deficits or excesses.

Observation:

• An abnormal intra- and interextremity distribution of Tl-201 was noted on a limb scan.
• The patient presented with a unilateral tremor affecting one side of the body.
• The observed scintigraphic abnormality correlated with the presence of tremor.

Findings:

• The abnormal Tl-201 distribution pattern is attributed to increased blood flow in the muscles affected by the tremor.
• This hyperperfusion is a direct physiological response to the sustained muscle activity characteristic of tremor.
• The study highlights a potential cause for non-specific findings on Tl-201 limb scans.

Implications:

• Clinicians should consider tremor as a potential explanation for unexpected Tl-201 limb scintigram abnormalities.
• This understanding may help avoid misinterpretation of scans and unnecessary further investigations.
• Incorporating clinical information, such as the presence of tremor, is crucial for accurate scintigraphic interpretation.