who said he had observed cases of osteopenia and osteoporosis in teenagers.

他说，他已经观察到数个发生在青少年身上的骨质缺乏和骨质疏松症病例。

Conclusions Systemic osteopenia and osteoporosis is a risk factor for periodontal tooth loss.

结论骨质疏松症是牙周病的危险因子之一。

Recent studies indicate that patients with type I neurofibromatosis usually have osteopenia or osteoporosis.

最近研究表明I型神经纤维瘤病患者常表现出不同程度的骨量减少或骨质疏松。

Osteopenia increased the risk as evidenced by BMD (based on 17 patients) and the older age of these patients.

检测BMD(根据17名患者的数据)和老年患者表明骨量减少增加了危险性。

Objective It is to discuss the relation between digestive system malignant tumor and osteopenia of elderly people.

目的探讨消化系统恶性肿瘤与老年人骨量减少的关系。