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H Brisse

Publications and source records attributed to H Brisse.

25 records · Page 2Linked to original sources
PubMed1998

Magnetic resonance imaging of the fetus.

Fetal magnetic resonance imaging (FMRI) has gained considerable interest during the last decade, especially in its intracranial applications. Due to its high soft-tissue contrast and presumed safety, FMRI should be accepted as a complementary technique in prenatal diagnosis, useful either to elucidate equivocal findings on routine US studies or to further delineate some pathological entities. Normal patterns of fetal brain maturation, as shown by FMRI, are described because they are of paramount importance to accurately evaluate intracranial diseases. To date, however, FMRI requires specialised facilities and should be considered as an evolving clinical research modality and performed within precise guidelines in a multidisciplinary approach to prenatal pathology.

Brain↗
PubMed1998

Outcome of residual mediastinal masses of thoracic lymphomas in children: impact on management and radiological follow-up strategy.

BACKGROUND: Following treatment with chemotherapy and radiotherapy, patients with thoracic lymphomas may demonstrate benign residual mediastinal masses, composed of inflammatory, fibrous or necrotic tissue. Because of the potential risk of viable tumour cells within the mass, histological verification of the nature of these masses may be requested. OBJECTIVE: To study the outcome of thoracic lymphomas in children in order to optimise the radiological follow-up strategy of residual mediastinal masses (RMM). MATERIALS AND METHODS: A retrospective study of 39 children [24 with Hodgkin's disease (HD), 10 with non-Hodgkin's lymphoma (NHL), and 5 with anaplastic lymphoma (AL)]. The results of chest X-rays (CXR) and thoracic CT performed at the time of re-assessment were compared with the histology of the residual masses (n = 11) or the clinical course (n = 28). RESULTS: At the time of re-evaluation, 16/39 patients had residual mediastinal enlargement (RME) on CXR, and 18/39 patients had RMM on CT. Good concordance was observed between the two imaging modalities (K = 0.69). Two children with a RMM died from extra-mediastinal progression. Two children with NHL had active residual mediastinal lesions but neither had RMM. Sixteen cases of RMM were observed in the remaining 35 children and 9 of these masses were histologically verified as benign. A favourable course was observed in these 35 cases. CONCLUSIONS: RMM are frequent and generally benign. They are well shown on CXR and have a non-specific appearance on CT. Except when required by a treatment protocol, they could be submitted to further radiological follow-up before contemplating surgical verification.

Child↗
PubMed1998

[Prenatal MRI of corpus callosum agenesis. Study of 20 cases with neuropathological correlations].

Twenty prenatal MR studies of corpus callosum agenesis were retrospectively studied and compared with neuropathologic examinations (18) or postnatal imaging (2). Corpus callosum agenesis were either complete (14) or partial (6). Positive diagnosis was made in 19 cases/20. The diagnosis of "isolated" or "associated" corpus callosum agenesis was assessed in 11 cases/15. MR depicted 15 of the 33 associated neurologic abnormalities. Prenatal MR is a valuable complementary technique for the diagnosis of corpus callosum agenesis when sonography is doubtful. MR could improve prognosis evaluation, since it enables depiction of associated abnormalities, notably gyral abnormalities, posterior fossa malformations, and intra-cranial cysts. MR images prove to be useful before neuropathologic examinations.

Agenesis of Corpus Callosum↗
PubMed1997

Supratentorial parenchyma in the developing fetal brain: in vitro MR study with histologic comparison.

PURPOSE: To assess the in vitro MR signal of the developing brain through histologic comparisons. METHODS: Five healthy fetal specimens aged 16, 19, 22, 27, and 34 gestational weeks were studied in vitro using T1- and T2-weighted sequences in frontal and axial planes. Neuropathologic studies included sections in the same frontal plane. Comparison of histologic sections with measurements of the relative widths of the layers of different signal intensities enabled us to assign cellular correspondence to each MR layer. RESULTS: In the cerebral mantle, a layered pattern was observed on both T1- and T2-weighted images. In the basal ganglia, signal from the pallidum and thalamus was isointense with white matter from 16 to 22 weeks' gestation; then, from 27 and 34 weeks' gestation, the signal was relatively high on T1-weighted images and low on T2-weighted images. The neostriatum had a relatively low signal on T1-weighted images and a high signal on T2-weighted images from 16 to 27 weeks' gestation: then, at 34 weeks' gestation, the signal was relatively high on T1-weighted images and low on T2-weighted images. CONCLUSION: MR imaging can clearly show specific patterns of growing fetal brain in vitro.

Basal Ganglia↗
PubMed1996

[Magnetic resonance imaging of the fetus. Contribution to antenatal diagnosis].

Magnetic resonance imaging (MRI) of the fetus has been developed over the last 10 to 15 years. This new imaging technique cannot remplace ultrasonography which remains the key examination for antenatal diagnosis but can add further improvements over ultrasonographic findings, particularly in evaluating the fetal brain. MRI of the fetus has thus been focused in this area, the main studies aiming at analyzing brain malformations and at searching for ischemic or hemorrhagic lesions and possible gyration anomalies. Advances in data processing software and volume acquisition and the development of the echo-planar technique and T2-weighted sequences are currently under study. MRI of the fetus has thus progressed rapidly. It is however a long costly examination which may not be well tolerated by pregnant women. Currently, routine MRI of the fetus is not possible, because of the requirement for specialized facilities. This new technique, still in the evaluation phase, should be studied using strict protocols reserved for centers specialized in antenatal diagnosis.

Female↗