While often compared with 47,XXY/Klinefelter syndrome because of shared features including tall stature and hypergonadotropic hypogonadism, 48,XXYY, 48,XXXY and 49,XXXXY syndromes
[genetic.org]
IQ with an often subtle intellectual deficit in childhood but a progressive (moderate to severe) deterioration with age (IQ varying between 70 and 20), by the absence of tall
[orpha.net]
Report of the patient 22 years old male referred because of tall stature, sexual perversion with underdeveloped genitalia and poor scholastic performance.
[endocrine-abstracts.org]