Biomedical subjects

Gerhard Förster

Publications and source records attributed to Gerhard Förster.

4 recordsLinked to original sources

PubMed2004

[Testing the sense of smell using validated procedures].

There is a growing interest into the investigation of smell disorders in both research and clinical practice. For psychophysical ("subjective") investigations related to the sense of smell a variety of test kits are available, namely the various "Sniffin' Sticks" kits, the UPSIT (University of Pennsylvania Smell Identification Test) or the CCSIT (Cross-Cultural Smell Identification Test). Recording of olfactory evoked potentials (OEPs) and respiration olfactometry can be used for diagnosing smell dysfunctions in a more objective way.

Humans↗

PubMed2004

[Testing the sense of taste using validated procedures].

Psychophysical tests related to the sense of taste are usually less complex than those of the sense of smell. In addition to global tests a regional examination of the sense of taste might be indicated to search for nerve lesions. There are numerous validated psychophysical tests available based on the administration of liquid or solid substrates. The use of electrical currents (electrogustometry) is especially feasible for a rapid regional testing. The registration of gustatory event-related potentials to objectify results from psychophysical examination is possible although limited to a few centers world-wide.

Electrophysiology↗

PubMed2003

Hemangiopericytoma: a rare head and neck tumor.

Among the rare malignant tumors of the paranasal sinuses and the middle ear, the hemangiopericytoma represents a very rare tumor entity. Reviewing four cases treated in our ENT department, we present here our experiences with this tumor. Inpatient and outpatient medical records from 1976 to 2001 were evaluated retrospectively. For the whole period we found four patients, three women and one man, who were treated with the diagnosis of hemangiopericytoma. Three tumors were localized in the paranasal sinuses (two in the maxillary sinus, one in the frontal sinus) and one in the middle ear. While the two tumors of the maxillary sinus and the tumor of the middle ear were treated only by surgery, the patient with the tumor of the frontal sinus also received postoperative irradiation because of an endocranial infiltration. This patient was the only one who developed an endocranial recurrence 14 years later on the opposite site, which again was treated with a combination of surgery and radiotherapy. The hemangiopericytoma as a very rare tumor in the paranasal sinuses and the middle ear should be treated with surgery. In our view, an adjuvant radiotherapy is indicated only in selected individual cases.

Adolescent↗

PubMed2002

Headache as an unusual presenting symptom of retropharyngeal ganglioneuroma.

Ganglioneuromas are rare benign neurogenous neoplasms. The clinical symptoms of ganglioneuromas of the neck are usually mild and non-specific and definitive diagnosis requires a histological examination. We present the case of a 35-year-old female who complained of retroauricular pain as her first symptom and who was initially diagnosed with migraine. ENT examination revealed a bulging of the left pharyngeal wall. Fine-needle aspiration biopsy was misleading in terms of diagnosis. Histology after extirpation showed a ganglioneuroma. Ganglion cell differentiation was proven using the new intermediate filament class alpha-internexin immunohistochemical staining technique. Headache is an uncharacteristic symptom of ganglioneuroma and an interdisciplinary approach is required to find a possible cause. Periauricular pain without abnormal otoscopic findings should lead the otorhinolaryngologist to consider a retropharyngeal condition, especially if combined with dysphagia. Complete resection of the tumor using modern microsurgical techniques is the best way to extract ganglioneuroma today.

Adult↗