Hyperthyroidism Incidentally Noted on Lymphoscintigraphy

Area of Science:

• Nuclear medicine
• Endocrinology
• Vascular imaging

Background:

• Lymphedema evaluation often requires specialized imaging techniques.
• Lymphoscintigraphy is a diagnostic tool used to assess lymphatic system function.
• The case highlights the potential for incidental findings during diagnostic procedures.

Observation:

• A patient undergoing lymphoscintigraphy for limb edema showed unexpected radiotracer uptake in the thyroid region.
• Incidental thyroid activity was observed on delayed images from both upper and lower limb lymphoscintigraphy scans.
• The observation occurred despite the primary diagnostic focus being on the lymphatic system.

Findings:

• The incidental finding of thyroid activity prompted further investigation.
• Graves disease was diagnosed based on the observed thyroid uptake, clinical symptoms, and laboratory results.
• This case demonstrates an unusual presentation of Graves disease discovered during a non-thyroidal imaging study.

Implications:

• Lymphoscintigraphy can yield unexpected findings related to other organ systems.
• Incidental radiological findings require thorough clinical correlation and further diagnostic workup.
• This case underscores the importance of careful image interpretation in nuclear medicine for comprehensive patient diagnosis.