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Biomedical subjects

L B Tubergen

Publications and source records attributed to L B Tubergen.

9 recordsLinked to original sources
PubMed1989

Current diagnosis of acoustic tumors.

This article discusses the most direct and cost-effective means of diagnosing acoustic tumors. The sensitivity and specificity of current diagnostic tests are reviewed. Newer techniques, including magnetic resonance imaging (MRI), have changed the diagnosis of acoustic neurinomas. Our current recommendation is to do a screening auditory brainstem evoked response (ABR) if the neurotologic examination and audiometry indicate a possibility of tumor. If the audiogram and examination indicate a high probability of tumor, we may proceed directly to magnetic resonance scanning.

Evoked Potentials, Auditory↗
PubMed1986

Transmastoid labyrinthectomy.

Labyrinthectomy is an effective technique in the surgical treatment of vertigo. We believe that the transmastoid approach is the most direct method of vestibular ablation. This technique provides direct visualization of vestibular neuroepithelium and allows for positive identification of the facial nerve. Vertigo was successfully controlled by this method in thirty-seven (97%) of thirty-eight patients.

Follow-Up Studies↗
PubMed1980

An unusual congenital middle ear ossicular anomaly.

Unilateral congenital absence of the stapes suprastructure occurred in association with displaced attachment of the stapedial tendon on an abbreviated incudal lenticular process. The stapes footplate was intact and mobile, and the middle ear was otherwise normal. This is interpreted to be a developmental aberration involving partial absence of a second branchial arch derivative. The preoperative history of no trauma or surgery and the audiologic analysis correlated with the occurrence of this anomaly. This appears to be the first reported case of this unusual congenital anomaly. In addition, it adds a unique item to the differential diagnosis of the pathologic features implicated in an ear with a conductive deficit, intact stapedius reflex, and tympanogram consistent with ossicular discontinuity.

Adult↗
PubMed1980

Isolated intralabyrinthine schwannoma.

Although most vestibular schwannomas arise in the internal auditory canal, a more peripheral site of origin is possible. We report a case of isolated schwannoma limited to the labyrinthine vestibule. Our description of the location of this tumor is further documentation that schwannomas can arise from the terminal vestibular nerve fibers to the cristae or maculae. Either the nerve roots of the superior vestibular nerve to the utricle and horizontal and superior semicircular canal cristae, or the nerve roots of the inferior vestibular nerve to the saccule and posterior semicircular canal crista may have been the locus of origin of this unusual tumor. Intralabyrinthine schwannoma should be included in the differential diagnosis in the face of progressive auditory and vestibular dysfunction. Because conventional roentgenographic studies usually fail to demonstrate the presence of schwannoma in this location surgical exploration of the labyrinthine vestibule in the presence of unserviceable hearing and incapacitating vertigo is indicated.

Diagnosis, Differential↗
PubMedDate not supplied

Unilateral complete aplasia of the inner ear with associated tracheoesophageal fistula: report of a case.

A case of unilateral complete aplasia of the petrous apex and inner ear associated with H-type tracheoesophageal fistula is reported. polytomography, computerized axial tomography, and plain film radiography confirmed the presence of this rare variant of inner ear aplasia. This patient, who has normal facial nerve function, is, to our knowledge, the first reported case of a nonthalidomide, Michel-type aplasia since the original report of Michel more than a century ago. Unilateral complete inner ear aplasia associated with tracheoesophageal fistula has not been previously reported.

Child↗