Lege Artis Medicinae

[Gastrointestinal stromal tumor]


FEBRUARY 20, 2001

Lege Artis Medicinae - 2001;11(02)

[Gastrointestinal stromal tumors were subject of much controversy in the last decades. This type of tumors was delineated from the leiomyoma - leiomyosarcoma group. GISTs show variable histological picture, moreover, they are capable of dual (neurogen and myogen) differentiation as it is proved by immunohistochemical and ultrastructural studies. These tumors have relatively good prognosis, only 10-30% of them is malignant, although it is difficult to predict their behaviour in a given case. The most reliable signs of malignancy - cytological pleoimorphism, high mitotic activity, proliferation index above 10 %, and aneuploid DNA content - are generally accepted. The treatment of choice is excision, but not enucleation. Radical surgery is not necessary, since lymph node metastasis is exceptionally rare. Further investigations revealed electronmicroscopical and immunohistochemical (CD 34, CD 117) similarities of tumor cells and interstitial cells of Cajal (ICC) located in the wall of the bowel. The results of these investigations led to the theory that cells of GIST and ICCs are of the same stem cell origin. Molecular genetic studies are also of great help in the differential diagnosis and in predicting the prognosis of GISTs. Mutations in the c-kit gene can not be detected in leiomyomas, so they are thougt to be specific for GISTs. Mutation of exon 11. of chromosome 4. is observed only in malignant GISTs.]



Further articles in this publication

Lege Artis Medicinae

[The role of steroid hormones in the protection against oxidative stress]


[The incidence of vascular diseases increases in postmenopausal women. This negative trend seems to be controllable favourably by hormone replacement therapy (HRT). Based on the free radical mediated mechanism of atherogenesis the authors try to find the reasons for these observations on the basis of their and others’ data. They consider the increase of activity and amount of neutrophil enzyme myeloperoxydase by certain steroid particulars one of the most important elements of the vasoprotective effect of HRT. This increase diminishes the production of superoxide anion by the inhibition of the NADPH-oxidase enzyme. The observation proved firstly by the authors, that the plasma levels of myeloperoxydase - and so the ability for the inhibition of superoxide anion production by neutrophils - decreases in elderly people, might explain the higher incidence of some free radical mediated illnesses in the elderly. The authors also give a short review of antioxidant effects of steroids in general.]

Lege Artis Medicinae

[The importance of vitrectomy in the management of diabetic retinopathy in proliferative stage]


[Vitrectomy is a closed microsurgical technique, by which intraocular tissue, blood and foreign bodies can be removed through a small incision in the pars plana with an automated suction-cutting device (vitrectom), while maintaining normal or slightly elevated intraocular pressure. This technique requires many accessory instruments (microscope, endoillumination, intraocular instruments, endolaser). The main application of vitrectomy is the treatment of severe complications in diabetes mellitus: diabetic retinopathy in the proliferative stage. Vitrectomy is indicated in diabetic retinopathy for the removal of intraocular bleeding and for the treatment of complications of diabetic proliferative vitreoretinopathy (recurring bleeding, tractional and rhegmatogenous retinal detachment). In the case of intraocular bleeding, early vitrectomy is better than delayed, providing good visus (V: 0,5) in 25% of all patients (based on literature data). In retinal detachment cases of tractional origin, surgery provides satisfactory visus for self-care in 2/3rd of all patients.]

Lege Artis Medicinae

[Alphabetic index 1991-2000]

Lege Artis Medicinae

[„There should be someone to hold the hand of the dying!” Deep interviews on the difficulties of caring for the dying]


Lege Artis Medicinae

[No, non and variations]

GRÉTSY Zsombor

All articles in the issue

Related contents

Clinical Oncology

[Current management of GIST]


[Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors of the gastrointestinal tract. GISTs are generally resistant to chemotherapy and radiotherapy. The understanding of pathology at molecular level promised the development of novel treatment modalities. KIT and PDGFRA gene mutations play an important role in the pathogenesis of GIST. IMutational analysis should be considered as standard practice during the diagnostic work-up, since it has a predictive value for sensitivity to molecular-targeted therapy and also has prognostic value. The aim of this review is to summarize recent knowledge about diagnosis, treatment and follow up of GIST.]

Hungarian Radiology

[Inflammatory myofibroblastic tumor in rare abdominal localisation]

NAGY Tamás, GÁBOR Valéria, NAGY Csaba Balázs, PUSKÁS Tamás

[INTRODUCTION - Inflammatory myofibroblastic tumor is a rare entity. The etiology and pathomechanism of this tumor is still unknown. In most of the cases it behaves as a benign or locally recurrent tumor and does not metastasize, but because of its aggressive local growth it can be judged malignant. For an accurate diagnosis adequate imaging (CT, MR), invasive intervention which is usually surgical excision and pathologic or histological examination must be performed. CASE REPORT - A case of a 19 year old woman is presented who was diagnosed by a CT scan with a 4 cm tumor in the midline of the upper third of the abdominal cavity. After surgical excision the inflammatory myofibroblastic tumor was confirmed after the pathological inspection. CONCLUSION - Despite that inflammatory myofibroblastic tumor is infrequent in virtue of the clinical picture and imaging exams we have to take this disease into account. The misdiagnosis can lead to unnecessary invasive interventions and psychological effort for the patient which could be avoided by the cooperation of the different subspecialties and thoroughgoing medical examination.]

Clinical Neuroscience

[Frontotemporal dementia - Part II Differential diagnosis, genetics, molecular pathomechanism and pathology]

GALARIOTIS Vasilis, BÓDI Nikoletta, JANKA Zoltán, KÁLMÁN János

[This is a comprehensive paper in three parts covering history, prevalence, clinical forms, differential diagnosis, genetics, molecular pathomechanism, pathology, clinical diagnosis and treatment of frontotemporal dementia (FTD). The second part focuses on the differential diagnosis, genetics, molecular pathomechanism and pathology. The clinical diagnosis of frontotemporal dementia is based on the presence of a prominent disturbance of the executive function and of frontal lobe syndrome or a progressive aphasic syndrome without severe global cognitive impairment. Of other dementias, it is primarily Alzheimer’s disease that it should be differentiated from, but other psychiatric disorders must also be ruled out. The disease has familial and sporadic forms. Recent identification of mutations in the gene encoding the microtubule-associated tau protein in the inherited frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17) has demonstrated that various tau dysfunctions can lead to neurodegeneration. Tau gene mutations have varied effects on the biology and function of the protein. This heterogeneous pathomechanism explains the wide range of clinical and neuropathological features observed in the FTDP-17. Tau and ubiquitin antibodies can be detected by sensitive immunohistochemical methods. The diagnosis of FTD should be based on neuropathological examination, and this is also the only method by which it can be definitely differentiated from other types of dementias.]