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Biomedical subjects

P Meriot

Publications and source records attributed to P Meriot.

11 recordsLinked to original sources
PubMed2006

[Post-traumatic orbital emphysema: a case report].

Orbital emphysema is often associated with orbital fracture or communication with paranasal sinuses. It is usually moderate but could be the cause of optic neuropathy or central retinal artery occlusion. We report a case of massive orbital emphysema with ocular hypertony and prethrombosis of the central retinal artery. Emergency surgical decompression performed by an ophthalmologist and an otorhinolaryngologist provided complete and prompt relief. The authors emphasize the importance of preventing nose blowing after orbital trauma or surgery.

Adult↗
PubMed2004

[Persistence of the stapedial artery: three cases].

The authors report three cases of persistence of the stapedial artery, discovered by computed tomography examination. For two cases, a clinical symptomatology was present but probably related to the association with an aberrant carotid artery in the middle ear; the only case of isolated persistence of the stapedial artery was asymptomatic. Direct visualisation of the abnormal artery was possible on the C. T. scans in two cases and a collateral sign as a larger tympanic part of the facial canal was found in the third case inducing a MRI. The incidence of this anomaly is 0.48 per cent from 1,045 dissections of temporal bones but it is generally clinically unrecognized. The hyoïdo-stapedial artery appears and develops at the 7-18 mm embryonic stages. Partial or complete persistence have been described associated with no regression or no division of the ventral pharyngeal artery.

Adult↗
PubMed1999

[Imaging of post-traumatic tinnitus, vertigo and deafness].

Tinnitus, hearing loss, and more rarely disequilibrium are common sequela of temporal bone trauma. Hemotympanum may cause a transient and immediate conductive hearing loss. HRCT depicts ossicular dislocation (most frequently incus), producing a long-term conductive hearing loss. Labyrinthine trauma causing neurosensory hearing loss or/and acute vertigo may be depicted by MRI, showing an abnormal non-enhancing high signal T1 of the membranous labyrinthine fluid. MRI also may show low signal T1 and T2 fibrotic areas of the membranous labyrinth, especially of interest if cochlear implant surgery is planned. Perilymphatic fistulas are to be searched in case of fluctuant hearing loss. Both HRCT and MRI may show window damage: filling of the tympanic recess, rupture of the window membrane, intra-vestibular luxation of the stapes, or occasionally pneumolabyrinth.

Ear Ossicles↗
PubMed1997

[Benign glial cysts of the pineal region].

A review of the pertinent literature regarding glial cysts of the pineal region is presented. Various pathogenic factors have been advocated such as the physiological involution of the pineal gland, a sequestration of the embryonic cavum pineale or the degenerative evolution of glial inclusions within the pineal gland. The pathological description is classical with three layers: an external fibrous capsule, an intermediate layer of pineal tissue and an internal glial wall. Imaging of these lesions is typical, namely the thin rim of peripheral contrast enhancement and the presence of calcifications. These cysts are more frequent in women in their third decade of life. They are almost always latent and their fortuitous disclosure at NMR examinations is common. Some of them will nevertheless cause intracranial hypertension due to hydrocephalus and hemorrhage. Those symptomatic cysts should be treated. Surgical excision has been the method of choice and the results are good. More recently a mere stereotactic needle aspiration has been performed with satisfactory long-term results.

Adult↗
PubMed1995

[Congenital neck masses. Embryonic origin and diagnosis. Report of the CIREOL].

Various congenital cervical anomalies are found in the neck region including defects of the branchial apparatus (branchial, thymic and parathyroid anomalies) and vascular anomalies. They manifest as cystic masses, sinuses, fistulas and as ectopic glands. This multicentric retrospective imaging study done in 5 different radiological centers (4 adult radiological departments and 1 pediatric radiological department) shows the result in understanding the congenital cervical anomalies and include 63 patients. The age of the patients varied between 24 days-81 years with a mean age of 23 years. This study included 27 patients having congenital branchial pouch anomalies (4 cases of anomalies of obliteration of the 4 th arch), 14 cases of cervical cystic hygromas, 11 thyroglossal tract cyst cases, 1 congenital laryngocele case, 1 case of jugular ectasia, 3 cases of capillary haemangioma. The embryologic basis of these different malformations were reviewed. Their characteristic findings and sites were illustrated together with their typical et atypical appearances. The frequency of occurrence of each branchial anomaly were plotted, the second branchial cleft cyst being by far the most common congenital cystic neck mass (70%). The study revealed the role of different imaging modalities in the diagnosis of various congenital cervical anomalies, especially in some particular complicated cases of congenital neck masses presenting in adult. Imaging study helps the clinician to anticipate any difficulties in unforeseen circumstances that may arise including infection haemorrhage, or parapharyngeal extension. Understanding the various radiologic appearances of these anomalies is greatly aided by familiarity with their embryologic origin. Moreover, considering the anatomic location and radiologic appearance, the precise embryologic origin can be accurately predicted.

Adolescent↗
PubMed1987

Radiologic anatomy of duplication of the inferior vena cava: a trap in abdominal imaging. A report of 8 cases.

Eight cases of duplication of the inferior vena cava are reported. Three of these bear witness to the errors of interpretation that may be committed when the anomaly is not initially detected in the ultrasonographic transverse sections and when no preliminary phlebography is available. Two other cases illustrate the influence of this duplication on the choice of the prophylactic surgical treatment of pulmonary embolism. The last clinical observation indicates the need to puncture both the femoral veins when performing iliocaval phlebography. Finally, two observations on the cadaver help to clarify the imaging appearances of this anomaly. The report concludes with a review of the classical anatomic and pathogenic concepts and a short discussion of the practical problems posed by duplication of the inferior vena cava.

Adult↗
PubMed1987

[A simple method for measuring anteversion of the acetabulum from a frontal radiograph of the hip].

A simple, reproducible and reliable method is proposed for measurement of cotyloid version. Using a standing frontal image of hip, the cotyloid borders are identified and a single-plane geometric projection determines the precise degree of version. This study can also be made from a conventional frontal pelvic image with bipodalic weight bearing. Knowledge of spatial orientation allows a better approach to head-cotyle biomechanical phenomena and thus improved understanding of the genesis of certain hip diseases.

Acetabulum↗
PubMed1985

[Transverse fracture of the 2nd sacral vertebra with neurological signs. Apropos of a case].

The authors report a case of transverse fracture of the second part of the sacrum with neurological signs. Whilst such a lesion would appear very rare, associated involvement of the sacral roots is very common. Recovery of the neurological deficit syndrome is hazardous. A review of the literature fails to provide the basis for a defined programme of management.

Adolescent↗
PubMedDate not supplied

CT appearances of ossicular injuries.

Trauma of the ossicular chain is a frequent complication of temporal bone injury. Skull trauma from blows to the temporal, parietal, or occipital region (with or without fracture of the temporal bone) is the main cause of ossicular injury; other modes of injury are rare. Ossicular injury usually occurs as a dislocation, of which there are five types: incudostapedial joint separation, incudomalleolar joint separation, dislocation of the incus, dislocation of the malleoincudal complex, and stapediovestibular dislocation. Fracture of the malleus, incus, or stapes is uncommon. High-resolution computed tomography is the method of choice for evaluation of ossicular trauma. Joint separation and fracture of the stapes are seen on axial images; coronal images may aid visualization. Both axial and coronal images are needed for evaluation of a dislocated malleus or incus. Fracture of the malleus or incus is detected with axial or coronal images; reformatted images may also be useful.

Adolescent↗