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Biomedical subjects

J P Lassau

Publications and source records attributed to J P Lassau.

At least 19 recordsLinked to original sources
PubMed1994

MRI of the epidural space after gelatin/gadolinium venous injection.

The head and vertebral column from two human cadavers were injected with a solution of gelatin and gadolinium (Dotarem) and imaged using magnetic resonance imaging (MRI). Comparisons between gross anatomic slices and corresponding images of the lumbar vertebral column confirmed the usefulness of a paramagnetic agent for visualising the epidural venous plexus. This technique provides accurate images of the posterior longitudinal ligament.

Contrast Media↗
PubMed1994

Upper tibial corticocancellous flap anatomy study (19.2.93).

A cortico-cancellous flap from the anterolateral aspect of the upper third of the tibia was presented. Sixty lower limbs of "fresh" cadavers were dissected. The vascular bundle includes the anterior tibial artery and its recurrent collateral branches and recurrent and musculoperiosteal arteries. The flap is harvested with the interosseous membrane and can be used either free or predicled. We used this flap for two patients suffering from pseudarthrosis. Long range clinical and radiological results are good.

Adult↗
PubMed1994

Computation of eyeball growth by magnetic resonance imaging (26.11.93).

The computation of eyeball growth has a wide field of applications in orbital and ocular pathology. An anatomic and MRI study to compute eyeball growth has been done. The anatomic study was made to determine the best MRI parameters to calculate the ocular surface; then this surface was computed by MRI in the neuro-ocular plane in fetuses and children aged from 0 to 13 years. The curve of eyeball growth shows rapid growth in utero and until 18 months, followed by a phase of slower growth. This method allows measurement in two dimensions, which we find complementary to ultrasound in the antenatal search for certain congenital malformations.

Adolescent↗
PubMed1994

Neurosurgical anatomy of the anterior interhemispheric approach for aneurysms of the anterior communicating artery (26.6.92).

The anterior interhemispheric approach for aneurysms of the anterior communicating artery was studied in ten cadavers. This approach presents several advantages over the pterional approach widely used in neurosurgery. It allows direct access to the region of the anterior communicating artery complex with minimal retraction of the brain and preservation of the olfactory tract and the gyrus rectus.

Cerebral Arteries↗
PubMed1994

Anatomic study of the orbital septum (22.10.93).

The orbital septum separates the intraorbital fat from the palpebral part of the orbicularis oculi m. An anatomic study after injection of colorant into the intraorbital fat allows definition of a fibroadipose layer anterior to the orbital septum. This consists of radial fibers and extraorbital fatty lobules. The septum is derived embryologically from the mesenchyme of the second arch, but the structure of the anterior layer remains controversial. The septum has an important mechanical function in containing the orbital fat and is involved in orbital movements. A knowledge of these different layers facilitates surgical approaches and helps to define the anatomic landmarks in palpebral surgery for conditions such as ptosis and in blepharoplasty.

Anthropometry↗
PubMed1994

[Oculo-orbital anatomy and nuclear magnetic resonance: use in ocular growth and fetal pathology].

The computation of eyeball growth has a wide field of applications in orbital and ocular pathology. An anatomic, macroscopic, histologic and RMI study has correlated the different oculo-orbital signals with the anatomy: a study of compute eyeball growth has been done. The anatomic study was made to determine the best MRI parameters to calculate the ocular surface. The surface was computed by MRI T2 weighted in the neuro-ocular plane in children aged from 0 to 13 years. The curve of eyeball growth shows rapid growth in utero until 18 months and then a phase of slower growth. A second study with fetuses RMI of pregnant women showed the neuro-ocular plane of fetus. Application in antenatal pathology are interesting. Two cases of orbital tumor, with fetal diagnosis are analysed and histologically explained.

Adolescent↗
PubMed1993

Anatomic basis of laparoscopic surgery in the male pelvis.

Laparoscopic surgery of the male pelvis remains a risky procedure, with around 15% of perioperative complications, as compared to 0.03% in laparoscopic surgery for gynecologic and obstetric conditions. Many of these complications are due to the surgeon's being faced with an unfamiliar anatomic situation in his approach through the laparoscopic operative field. We have added to the data of the literature our anatomic and clinical experience in order to define the anatomic basis of surgical risk in this type of procedure. While dissection lateral to the iliac vessels (surgery of the spermatic cord) is safe, dissection medial to these vessels is more risky because of the confined anatomic relationships and their variations (particularly vascular anomalies and variable relations of the ureter).

Humans↗
PubMed1993

Variations in arterial blood supply and the risk of hemorrhage during percutaneous treatment of lesions of the pelviureteral junction obstruction: report of a case of testicular artery arising from an inferior polar renal artery.

Acute hemorrhage during percutaneous surgery on the pelviureteric junction obstruction has been estimated to be 2-3%. Following the experience of peroperative bleeding from a vascular variation, the authors discuss the arterial anomalies of the renal pedicle which may carry the risk of hemorrhage during percutaneous surgery in this region. Arteries in front of or behind the renal pelvis are the cause of ureteropelvic function obstruction in 15-52% of cases and because of their close relationship with the upper urinary tract can complicate the procedure of endopyelotomy. Endourological techniques are inadequate for avoiding the risk of vascular damage during the necessary maneuvers. Inferior polar arteries occur in 9% of the population and their different courses are described. They are not always responsible for the vascular obstruction in the pelviureteric syndrome, and it is the exact determination of this responsibility that makes imaging essential. Arteriography performed in our case allowed embolisation of the damaged inferior polar artery and also showed the anomalous origin of the testicular artery from this polar artery; this appears to be only the second description of this anomaly. This variation is discussed in a review of the literature. In fact the testicular artery has a high or aberrant origin in 20% of cases; in 5-6% of these the origin is from a main or supernumerary renal artery. Origin from an inferior polar artery is exceptional.

Adult↗
PubMed1991

Anatomical basis of a new naso-labial island flap.

We describe a nasolabial island flap with a proximal base. This anatomical study confirms the interest of a proximal base especially with regard to venous return. As opposed to classical naso-labial flaps with subcutaneous pedicle, it has a vascularization of musculo-cutaneous type which allows a greater degree of mobility and reliability. This flap is an effective therapeutic option in surgery for skin defects of the face.

Arteries↗
PubMed1990

The fibrous frame of the supraspinatus muscle. Correlations between anatomy and MRI findings.

30 MRI investigations of shoulders and 20 dissections of non embalmed cadaveric shoulders allowed us to demonstrate a particular organization of the supraspinatus muscle. In the anterior part of the muscle is an important fibrous frame with obliquely inserted muscle fibers. This organization suggests that this part of the supraspinatus muscle works as a "contractile tendon".

Humans↗
PubMed1978

[Functional anatomy of a completely ossified hyoid apparatus in man. Study with cineradiography].

Radiocinematographic study of the laryngo-pharyngeal area in a man showing an entirely ossified hyoid system, made during the course of chewing, swallowing, and sound utterance. Two facts seem noteworthy: 1) from the morphological point of view, we should search in organogenesis for an explanation of the ossification of the hyoid apparatus; 2) from the functional point of view, one notes considerably reduced movements of the bone, without any change in the swallowing, or in the speach functions.

Cineradiography↗