Biomedical subjects

Máximo Poza

Publications and source records attributed to Máximo Poza.

7 recordsLinked to original sources

PubMed2004

Bitemporal head crush injuries: clinical and radiological features of a distinctive type of head injury.

OBJECT: Most craniocerebral injuries are caused by mechanisms of acceleration and/or deceleration. Traumatic injuries following progressive compression to the head are certainly unusual. The authors reviewed clinical and radiological features in a series of patients who had sustained a special type of cranial crush injury produced by the bilateral application of rather static forces to the temporal region. Their aim was to define the characteristic clinical features in this group of patients and to assess the mechanisms involved in the production of the cranial injuries and those of the associated cerebral and endocrine lesions found in this peculiar type of head injury. METHODS: Clinical records of 11 patients were analyzed with regard to the state of consciousness, cranial nerve involvement, findings on neuroimaging studies, endocrine symptoms, and outcome. Furthermore, an experimental model of bitemporal crush injury was developed by compressing a dried skull with a carpenter's vice. Seven of the 11 patients were 16 years old or younger. All patients presented with a characteristic clinical picture consisting of no loss of consciousness (six patients), epistaxis (nine patients), otorrhagia (11 patients), peripheral paralysis of the sixth and/or seventh cranial nerves (10 patients), hearing loss (five patients), skull base fractures (11 patients), pneumocephalus (11 patients), and diabetes insipidus (seven patients). Ten patients survived the injury and most recovered neurological function. CONCLUSIONS: Static forces applied to the head in a transverse axis produce fractures in the skull base that cross the midline structures without producing significant cerebral damage. Stretching of cranial nerves at the skull base explains the nearly universal finding of paralysis of these structures, whereas an increase in the vertical diameter of the skull accounts for the occurrence of diabetes insipidus in the presence of an intact function of the anterior pituitary lobe. The association of clinical, endocrine, and neuroimaging findings encountered in this peculiar type of head injury supports the idea that this subset of injured patients has a distinctive clinical condition, namely the syndrome of bitemporal crush injury to the head.

Abducens Nerve Injury↗

PubMed2003

Inflammatory atlanto-axial subluxation (Grisel's syndrome) in children: clinical diagnosis and management.

BACKGROUND: Grisel's syndrome is a uni- or bilateral subluxation of the atlas on the axis associated with an inflammatory condition of the head or neck. This uncommon entity usually affects children. The condition seems to be secondary to hyperemia and laxity of the atlanto-axial joints. PATIENTS AND METHODS: We report clinical and neuroimaging findings, treatment modalities, and outcomes in 4 children with atlanto-axial rotatory subluxation (AARS) associated with a previous upper respiratory tract infection treated at our Unit during the last 7 years. RESULTS: All children presented with neck pain, head tilt, and reduced neck motion. In 3 patients, the condition was secondary to otitis media and in the remaining patient to viral pharyngitis. The diagnosis was established by clinical signs and symptoms and confirmed by neuroimaging studies, especially by computerized tomography and 3-D reconstructions. Early detection and treatment resulted in a good outcome in all patients. None of the patients required surgical treatment. CONCLUSIONS: Grisel's syndrome must be suspected in children with painful torticollis associated with an upper tract respiratory infection. The best results are obtained with early conservative treatment, which prevents chronic changes leading to persistent neck pain and deformity, namely atlanto-axial rotatory fixation (AARF). We emphasize the fact that the diagnosis of Grisel's syndrome is mainly clinical, while the diagnostic confirmation of AARF can only be attained by special neuroimaging techniques.

Anti-Inflammatory Agents↗

PubMed2003

Lumbar disc herniation in early childhood: case report and literature review.

INTRODUCTION: Lumbar disc herniation is a common condition in adults, uncommon in adolescents and exceptional below the age of 10 years. CASE REPORT: We report on a 6-year-old boy who presented with low-back pain and sciatica after having sustained an injury in a rear-end automobile accident. Due to our limited experience with protruded discs in this age group, we decided to be conservative initially. However, the persistence of incapacitating pain prompted surgical treatment. Operative findings consisted of a torn annulus, attached at one end to the cartilaginous plate, which formed a major portion of the extruded L5-S1 disc. DISCUSSION: A search of the literature yielded only four cases of lumbar disc (L4-5) protrusions in patients aged 9 years or younger. The child described here is one of the youngest patients with a lumbar disc rupture to be reported in the literature, and the first with an L5-S1 traumatic herniation.

Child↗

PubMed2003

Parkinson's disease and inflammatory changes.

In 1988 McGeer and colleagues (Neurology 38, 1285-91) observed an activation of the microglia in substantia nigra pars compacta (SNpc) and striatum of brains from patients with Parkinson's disease. In the years that followed several studies performed in the cerebrospinal fluid and during post-mortem analysis in parkinsonian patients revealed increased levels of cytokines, suggesting the activation of a proinflammatory response. Moreover, Langston and his group described the presence of active microglia in the SNpc of three patients who had been exposed to MPTP several years before death. These results suggested that the inflammatory response may increase negative feed-back into the damaged area of the cerebral parenchyma, inducing an imbalance that could perpetuate and/or accelerate neuronal death over a period of years. Similar results have been obtained in parkinsonian monkeys, rats and mice. For these reasons, several groups have treated parkinsonian animals with different anti-inflammatory drugs and obtained promising results. However, it is still not known whether inflammatory changes are responsible for active nerve cell death or whether they play a protective role in neurodegeneration. These changes are putatively related to neuronal loss and suggest that anti-inflammatory treatment for parkinsonian patients could have beneficial effects in the progression of the disease by slowing down the process of neuronal loss.

Animals↗

PubMed2002

Aplasia cutis congenita of the scalp.

CASE REPORT: We report the case of a newborn baby who presented with scalp aplasia cutis congenita and an underlying skull defect. DISCUSSION: We discuss the diverse options for the management of this condition and the feasibility of early surgical repair in the light of the current literature. We also comment on the possible role of benzodiazepines in the genesis of this lesion.

Abnormalities, Drug-Induced↗

PubMed2002

Thalamic tumors: clinical presentation.

INTRODUCTION: Thalamic tumors (TTs) account for approximately 1% of all intracranial neoplasms. TTs are seen predominantly in children and young adults. Most childhood neoplasms in this location are of glial lineage, a large proportion being low-grade tumors. The evolution of symptoms before diagnosis is characteristically shorter in children than in adults. CLINICAL PRESENTATION: Clinical features of TTs reflect the pressure of the mass on the cerebrospinal fluid pathways, the pyramidal tracts, the thalamic nuclei and the optic radiations. In this paper, we review the clinical data of 20 children with TTs seen at our hospital and compare the findings with those in the current literature. An acute presentation is not rare and was encountered in 20% of our patients, although most individuals had a subacute or slow evolution. Symptoms and signs of raised intracranial pressure (65%), motor deficits (40%), and seizures (35%), alone or in combination, were the most frequent manifestations of TTs. Behavioral and mental changes are not uncommon in TTs and were found in 25% of our patients. Involuntary movements (10%) and the classic thalamic syndrome (5%) were quite exceptional. Infants and young children with TTs may present with macrocephaly, psychomotor delay, and failing vision or disorders of ocular movements.

Adolescent↗

PubMed2001

Epidural hematoma from a cranial eosinophilic granuloma.

The formation of an epidural hematoma from an eosinophilic granuloma of the skull is an exceptional occurrence. A 9-year-old boy presented with severe headache, somnolence and vomiting following a minor head injury. Cranial computerized tomography scan showed a seemingly depressed skull fracture together with an epidural hematoma in evolution. A neoplasm and an epidural hematoma were removed at operation. Histopathological study of the excised mass confirmed the diagnosis of eosinophilic granuloma.

Bone Diseases↗