Answer 4 Karyotype. This patient’s presentation suggests a diagnosis of Klinefelter’s syndrome, which is most commonly associated with a 47,XXY karyotype. The most common manifestations of Klinefelter’s syndrome are infertility and small testes, affecting nearly 100% of patients. Testicular ultrasound is useful in the evaluation of testicular tumors, while serum ß-hCG is a tumor marker for testicular cancers. Serum prolactin levels would be helpful in the presentation of a pituitary tumor. Click here to return to the questions
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