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Biomedical subjects

B J Due-Tønnessen

Publications and source records attributed to B J Due-Tønnessen.

5 recordsLinked to original sources
PubMed2000

[Metotopic craniosynostoses].

BACKGROUND: Premature closure of the metopic suture leads to inhibited growth of the frontal bones, producing a keel-shaped forehead (trigonocephaly). Simple metopic synostosis is usually sporadic. Trigonocephalic patients account for 8-16% of the referrals to craniofacial centers, with a marked male predominance. Intracranial pressure (ICP) may be increased, whereas shunt-dependent hydrocephalus is infrequent. Infrequently, patients have intra- or extracerebral anomalies; one third have varying degrees of neuropsychological problems. The treatment is primarily surgical. MATERIAL AND METHODS: We present two patients who during infancy developed increasingly keel-shaped foreheads, retruded orbital rims, increased biparietal diameter and close-set eyes (hypothelorism). Both had raised ICP, but normal psychomotoric development. They were operated using radical fronto-orbital surgical remodelling. RESULTS: Recovery was uneventful. Three months post-operatively, they had pleasing cosmetic results with no symptoms of increased ICP. INTERPRETATION: Where metopic craniosynostosis is suspected, the infant should be examined clinically with palpation of fontanelles and sutures, evaluated with respect to the shape and development of the facial skeleton, as well as by X-ray of the skull sutures. Radical fronto-orbital surgical remodelling gives a stable correction of the craniofacial deformity and generally a satisfactory cosmetic result.

Cephalometry↗
PubMed2000

[Distraction osteogenesis--a new therapeutic principle in complex craniofacial synostosis].

BACKGROUND: Surgical treatment of syndromal craniofacial synostosis consists of combined neurosurgical and maxillofacial reconstructions of the neurocranium and midface. Patients often need several operations if they are to achieve a functionally and cosmetically good result. This is, in part, due to limitations in the amount of "acute" correction possible peroperatively with conventional surgical technique. MATERIAL AND METHODS: In recent years, a new method called distraction osteogenesis has been developed, by which the skeletal elements are gradually advanced. The method is based upon a process whereby the reparative callus formed between the surfaces of two bone segments is subjected to traction. This leads to new bone formation parallel to the vector of distraction. RESULTS: Distraction osteogenesis allows for greater mobilizations, hence the promise of fewer reoperations. INTERPRETATION: The method seems to be a valuable treatment modality in syndromal craniofacial synostosis, where major fronto-orbital, midface or maxillary reconstructions are often called for.

Craniofacial Dysostosis↗
PubMed2000

[Frontoethmoidal meningoencephaloceles].

Frontoethmoidal meningoencephalocele is a rare congenital disease where intracranial masses protrudes through a midline defect at foramen coecum from the anterior cranial fossa into the facial skeleton. The patient presents at birth with a soft-tissue swelling at the nasal bridge. In the majority of cases, the cele is completely covered by skin. The face is elongated, the nasal bridge is broad, the upper part of the nose is long, and the patients have telecanthus. Frequently, the patients have a normal psychomotor development, but may have intracerebral malformations and a shunt dependent hydrocephalus. Spinal fluid leakage may result in meningitis. Anosmia is infrequent. The patients may have a wide range of ophthalmological problems. Newborns with meningoencephalocele should be examined by a neurosurgeon. The investigation and work-up commences with a multidisciplinary approach. We present two patients with meningoencephaloceles.

Child↗
PubMed1994

Modified Robinson-Smith procedure for the treatment of cervical radiculopathy.

In the present study, a modified Robinson-Smith procedure was used surgery for cervical radiculopathy in 52 patients. Thirty-one one-level and 21 two-level operations were performed. All patients were followed up between 1 and 3 years (mean 23 months) after surgery with a clinical evaluation by an independent investigator including a radiological examination. In 26 patients the postoperative result was classified as excellent, in 23 the result was good, in 2 satisfactory, while one patient was unchanged compared to the preoperative examination. No patient developed worsening of symptoms after surgery. Of 18 patients with duration of symptoms of more than 4 years, 16 demonstrated markedly improvement. No permanent postoperative complications were seen. A modified Robinson-Smith procedure appears to be safe and reliable and can be recommended in surgery for cervical radiculopathy.

Adult↗