Martina Old Mature
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Patient underwent a right sided parasagittal frontoparietal craniotomy. A mostly calcified mass with several central soft areas that was invading and destroying a large part of the cerebral falx (with no invasion to the superior sagittal sinus) was completely removed. Partial duroplasty was performed. Surgery went without any complications. A control CT scan, performed on the first postoperative day, revealed a satisfactory finding, without any signs of ischemia, hemorrhage, or residual tumor. Patient recovered uneventfully. Tissue samples acquired during the surgical procedure underwent patohistological analysis. The tumor consisted of mature cartilage tissue, several fragments of bone tissue, and mature adipose tissue (Fig. 2). According to the WHO (World Health Organization) classification, it corresponded to a mature teratoma. An oncologist was consulted. There was no indication for further oncological treatment and the patient afterwards underwent regular radiological follow-up.
Before the diagnosis of a teratoma is established, it is important to exclude other intracranial neoplasms. The patient's age and biochemical markers, such as serum alpha-fetoprotein (AFP) and β-human chorionic gonadotropin (b-HCG), can be useful in differentiating teratomas from other intracranial neoplasms. If elevated, serum AFP levels are strongly indicative of a malignant teratoma. Spotted calcification and adipose components revealed using CT or MRI scans are characteristic for intracranial teratoma diagnosis.167Definitive diagnosis is confirmed using a patohistological finding. As mentioned earlier, teratomas are divided into three further subtypes depending on the maturity of their tissue. In addition to the mature and immature subtypes, teratomas can also manifest a great number of mitoses in an immature tissue sample, indicating a teratoma with a malignant transformation.6It is of great importance to determine the exact patohistological diagnosis using extensive sampling, as immature tissue can constitute even a minor part of the tumor and therefore direct to another treatment option.89
There are two main theories that could explain the pathogenesis of GCT in the central nervous system. While the germ cell theory suggests that teratomas arise from primordial germ cells which migrated during embryogenesis and underwent malignant transformation, the embryonic theory suggests that teratomas arise from a mismigrational pluripotent germ cell.67Since the brain midline structures are mostly affected with teratomas, and since the cerebral falx, the cavernous sinus walls, as well as the septum pellucidum are histological the same as the dura mater, it has been suggested that the abnormal migration of primordial germ cells into the dura mater might be responsible for the occurrence of intracranial mature teratomas.7It has also been hypothesized that this kind of migration is under the control of complex molecular events.6
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But on the court, if not off it, he still must mature. His stamina is suspect, and in the fifth set of his semifinal match with Wilander, his legs gave way and the steady Swede swamped him, 6-0. His strokes also are suspect. Until now, he has relied too much on his backcourt game, particularly his forehand.
\"I saw her mature a great deal,\" Isha Price said. \"I think that she understands that there is definitely a finite time to enjoy and participate and play the game at a high level. Being appreciative of that. Not that she didn't take it seriously before. But she has a new kind of respect for it.\"
The hematopoietic stem cell (HSC) niche is composed of many different types of support cells including endothelial cells, stromal cells, and osteoblast. Studies that ablated mature osteoblast showed that they might be important to support maintenance of HSCs. These studies used Col2.3ΔTK to ablate differentiated osteoblast with daily treatments of ganciclovir after which the samples were analyzed immediately. Two opposing studies have been done using this system one showing a decrease in HSC and another showing an increase thus the role of osteoblast in HSC maintenance is still unclear. We have used a different method of ablating cells using Osteocalcin (Oc) and Osterix (Osx) Cre to drive expression of a diphtheria toxin receptor (iDTR), in mature osteoblast and osteoprogenitors, respectively. We injected eight week old mice with three doses of diphtheria toxin and analyzed the LSK and LT-HSC populations a month after cell ablation. There was no effect when the osteoprogenitors were ablated using Osx-Cre; suggesting ablation at postnatal stages is likely necessary to see an effect using Oxs-Cre. On the other hand, we found that a month after ablation of the Oc expressing cells the osteoblast population had recovered but the LSK and LT-HSC populations were still affected with an increase in both populations, suggesting that being exposed to a defective niche might have long-term effects on the HSC population. 59ce067264
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