[35-year old patient with severe thromboembolism]

Area of Science:

• Endocrinology
• Genetics
• Vascular Medicine

Background:

• Klinefelter syndrome is a genetic condition affecting males, characterized by the presence of an extra X chromosome.
• Thromboembolism, including deep vein thrombosis and pulmonary embolism, represents a significant health concern.
• The association between Klinefelter syndrome and thromboembolic events requires further investigation.

Observation:

• A 35-year-old male presented with severe bilateral lower limb deep vein thrombosis and pulmonary embolism.
• Genetic analysis revealed a Klinefelter's mosaic karyotype (47,XXY [81%]/48,XXXY [19%]).
• No other causative factors for the thromboembolism were identified.

Findings:

• The patient's thromboembolism is presumed to be partly associated with his Klinefelter's mosaic.
• This case highlights a potential link between Klinefelter syndrome and an increased risk of thromboembolic events.
• Unusual habitus in male patients with thromboembolism may warrant consideration of Klinefelter syndrome.

Implications:

• Consider Klinefelter syndrome in the differential diagnosis for male patients presenting with thromboembolism, particularly those with atypical physical characteristics.
• Early diagnosis of Klinefelter syndrome is crucial for timely intervention.
• Testosterone substitution therapy is recommended for all patients diagnosed with Klinefelter syndrome to mitigate long-term health risks and prevent disease progression.