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Biomedical subjects

M Collard

Publications and source records attributed to M Collard.

At least 73 records · Page 4Linked to original sources
PubMed1978

[Fisher's syndrome. Peripheral or central origin (author's transl)].

The syndrome described by M. Fisher in 1956 includes ophtalmoplegia, ataxia, and generalized loss of reflexes. It is classically considered to be of peripheral origin and its relation to Guillain and Barre's syndrome in its mesencephalic form is debatable. The authors review 5 cases and discuss the question of a probable central origin. They base their opinion on the pathognomonic features of these cases and those in the literature, as well as the results of their oculographic and electromyographic studies. They stress the importance of the nature of the ataxia; the severe equilibrium disturbances noted in these patients could result, contrary to usual thinking, more from a central vestibular syndrome than from a cerebellar lesion.

Adolescent↗
PubMed1978

[The use of simultaneous angiography to determine the signification of vascular images in renal scintiscans with technetium (author's transl)].

Combined angiography and renal scintiscans were used by the authors in an attempt to determine the signification of the images and vascular tracings obtained after intravenous injection of technetium (99mTc). They conclude that the scintiscan images are essentially the reflection of cortical vascularization and that its duration, as determined by the scintiscan, is roughly equal to the mean transit time of the indicator employed (Tc). Arterial stenosis cannot be demonstrated by scintiscans using technetium.

Adolescent↗
PubMed1977

A morphological and chemical study of calcification of the choroid plexus.

Human choroid plexus was submitted to low temperature ashing (LTA) in order to isolate the calcification. The ashing residue was then subjected to morphological, chemical and structural studies using technics such as scanning electron microscopy, flame and flameless atomic absorption spectrometry, infrared spectrometry and X-ray diffraction. Morphologically, the calcification consisted of wound-up fibers forming granules with a diameter of 0.05 to 0.15 mm. The concretions were identified as cristalline Ca3(PO4)2 and hydroxylapatite. The content of trace elements was high, but within the limits found in other biological apatites. In some cases, however, the Fe content exceeded these limit values.

Calcinosis↗
PubMed1977

A morphological and chemical study of calcification of the pineal gland.

A general scheme of analysis for the investigation of minute calcification is presented. After low temperature ashing, the samples are subjected to chemical, structural and morphological study, using atomic absorption spectrometry, infrared spectrometry, X-ray diffraction and scanning electron microscopy. Details about the calcification of the human pineal gland are given. The content of trace elements is very high, but within the limits found in other biological apatites. It is concluded that calcification of the pineal is a more general occurence than has been realized.

Brain Diseases↗