1、One of the challenges associated with core biopsy, particularly with reference to papillary lesions, is the phenomenon of "epithelial displacement".

2、Microscopically, pseudoangiomatous stromal hyperplasia(PASH) is composed of anastamosing slit-like spaces in a densely collagenized stroma.

请教老师，epithelial displacement和anastamosing应该怎么解释呢，谢谢老师！这是乳腺病理中的内容。