本帖最后由 于 2010-08-23 19:26:00 编辑
Immature squamous metaplasia versus HG-SIL
(复习Ki-67/p16INK4a 在不成熟鳞化及HSIL中各自表达的对比图示)
Squamous metaplasia, a normal physiological process, is encountered frequently in cervical biopsies and loop electrosurgical excision procedures. The varied morphology results from the different stages of squamous metaplasia. Distinguishing between immature squamous metaplasia and HG-SIL can be extremely difficult, given the presence of increased N:C ratio and a relative lack of squamous maturation in both lesions. The metaplastic cells are generally uniform, round to oval, with a single nucleolus (fig 4A–C). The nuclear contours are generally smooth. The presence of significant cellular crowding, nuclear atypia and increased mitotic figures in the upper half of the epithelium can be the most helpful morphological features in supporting a diagnosis of high-grade CIN (fig 4D–F). CIN can show extensive involvement of endocervical crypts and the presence of significant nuclear pleomorphism should initiate a diagnosis of dysplasia, despite the presence of a superficial layer of endocervical glandular cells.
Immature squamous metaplasia:(A–C) H&E-stained section;
(B) Ki-67 immunohistochemistry demonstrating immunoreactivity restricted to the basal/parabasal zone;
(C) p16INK4a immunohistochemistry demonstrating non-specific, cytoplasmic blush.
High-grade squamous intraepithelial lesion (HG–SIL):(D–F) H&E-stained section;
(E) Ki-67 immunohistochemistry demonstrating immunoreactivity in the upper two-thirds of the epithelium;
(F) p16INK4a immunohistochemistry demonstrating strong, full-thickness nuclear and cytoplasmic immunoreactivity.
(J Clin Pathol 2007;60:449-455)
Immature squamous metaplasia versus HG-SIL
(复习Ki-67/p16INK4a 在不成熟鳞化及HSIL中各自表达的对比图示)
Squamous metaplasia, a normal physiological process, is encountered frequently in cervical biopsies and loop electrosurgical excision procedures. The varied morphology results from the different stages of squamous metaplasia. Distinguishing between immature squamous metaplasia and HG-SIL can be extremely difficult, given the presence of increased N:C ratio and a relative lack of squamous maturation in both lesions. The metaplastic cells are generally uniform, round to oval, with a single nucleolus (fig 4A–C). The nuclear contours are generally smooth. The presence of significant cellular crowding, nuclear atypia and increased mitotic figures in the upper half of the epithelium can be the most helpful morphological features in supporting a diagnosis of high-grade CIN (fig 4D–F). CIN can show extensive involvement of endocervical crypts and the presence of significant nuclear pleomorphism should initiate a diagnosis of dysplasia, despite the presence of a superficial layer of endocervical glandular cells.
Immature squamous metaplasia:(A–C) H&E-stained section;
(B) Ki-67 immunohistochemistry demonstrating immunoreactivity restricted to the basal/parabasal zone;
(C) p16INK4a immunohistochemistry demonstrating non-specific, cytoplasmic blush.
High-grade squamous intraepithelial lesion (HG–SIL):(D–F) H&E-stained section;
(E) Ki-67 immunohistochemistry demonstrating immunoreactivity in the upper two-thirds of the epithelium;
(F) p16INK4a immunohistochemistry demonstrating strong, full-thickness nuclear and cytoplasmic immunoreactivity.
(J Clin Pathol 2007;60:449-455)