Intrapericardial left-sided ectopic thyroid mass supplied by the left circumflex artery.

Area of Science:

• Cardiology
• Endocrinology
• Pathology

Background:

• Intrapericardial ectopic thyroid tissue is an exceptionally rare condition.
• Thyroid tissue within the pericardium can lead to significant cardiac and pulmonary complications.

Observation:

• A 47-year-old female presented with exertional dyspnea and ventricular extrasystoles due to an intrapericardial mass compressing the left atrium and pulmonary vein.
• The mass was supplied by two vessels originating from the left circumflex artery (LCX).

Findings:

• Histopathological examination revealed a regressive thyroid adenoma without evidence of malignancy.
• Thyroid hormone levels were not indicative of the condition, and postoperative hormone substitution was not required.

Implications:

• This case highlights the importance of considering rare ectopic thyroid tissue in the differential diagnosis of cardiac masses.
• Successful surgical resection is a viable treatment option for symptomatic patients.
• The management of such cases may not necessitate thyroid hormone monitoring or substitution post-operatively.