Sentence examples for diffuse astrocytoma from inspiring English sources
The WHO defines diffusely infiltrative astrocytic tumours with cytological atypia alone as grade II (diffuse astrocytoma), those also showing anaplasia and mitotic activity as grade III (anaplastic astrocytoma), and tumours additionally showing microvascular proliferation and/or necrosis as WHO grade IV.
a A 71-year-old man with diffuse astrocytoma.
Astrocytomas can be graded from low-grade circumscribed neoplasm, through diffuse astrocytoma, anaplastic astrocytoma and glioblastoma multiforme, which is a World Health Organisation (WHO) grade IV tumour.
Twelve patients had grade IV glioma (10 glioblastoma, 2 glioblastoma with oligodendroglioma component), 6 had grade III glioma (4 anaplastic astrocytoma, 2 anaplastic oligoastrocytoma), and 2 had grade II diffuse astrocytoma.
Comparisons of the T/N ratios of 11C-MET PET and the MIB-1 LI have found a significant correlation in diffuse astrocytoma but not in oligodendroglial tumor [5, 26, 28].
These glial tumors encompass: (i) diffusely infiltrating astrocytomas (i.e., diffuse astrocytomas, anaplastic astrocytomas and glioblastoma multiforme), (ii) oligodendroglial tumours (i.e., oligodendroglioma and anaplastic oligodendroglioma) and (iii) mixed gliomas (i.e., oligoastrocytoma and anaplastic oligoastrocytoma) (Kleihues and Webster, 2000).
Two primary diffuse astrocytomas that had no contrast enhancement in the tumor could not be visualized with 11C-4DST.
One of the two diffuse astrocytomas could be visualized with 18F-FLT but the other could not.
Two non-enhanced diffuse astrocytomas could not be visualized with 11C-4DST suggesthat that 11C-4DST does not readily cross the intact BBB, and 11C-4DST uptake in the tumor rather depends on the influx through the disrupted BBB similar to 18F-FLT.
In contrast 1p/19q codeletion is uncommon in diffuse astrocytomas [3].
