溃疡表浅、边界清晰，周围有充血。
The ulcer is shallow and sharply demarcated, with surrounding hyperemia.
形状特征是对图像中边界清晰的目标的最好表达方式。
Shape feature is the most suitable tool in characterizing image content object which has clear object outline.
而CT却显示无溶骨改变和恶性骨形成的边界清晰的病变。
CT demonstrates a well-circumscribed lesion without lytic changes or malignant bone formation.
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