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By Madlen Davies for MailOnline. A Chinese girl with a rare medical problem has the appearance of a child - despite being years-old. At seven years old, she stopped growing and was diagnosed with a tumour on her pituitary gland, which caused a deficiency in growth hormones. Zeng Yushan, 19 left , has the appearance of a seven-year-old as she stopped growing at this age due to a rare tumour on her pituitary gland. This gland releases growth and puberty hormones.