temporary enlargement of the breasts is not unusual or abnormal in boys during adolescence or during recovery from malnutrition. Gynaecomastia may be abnormal as, for example, in Klinefelter's syndrome.
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... Mendel). This XXY chromosomal anomaly is known as Klinefelter's syndrome, and the clinical features include the man being of above average height, gynaecomastia, and mental retardation (learning disabilities). The XYY chromosomal anomaly can be found in asymptomatic men. There may or may not be ...
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