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At least 145 records · Page 8Linked to original sources
PubMed1993

[Reconstruction of external ear with double-lobe skin flap].

The authors reconstructed the external ear and external auditory canal in fifty patients using double-lobe skin flap and three-point landmark method. After operation the new auricle is natural in appearance and correctly located. The hearing ability is increased in a part of patients. This article describes the method and main features of the operation.

Adolescent↗
PubMedDate not supplied

[Hernia of the external ear canal of uncommon origin].

The temporo-mandibular joint is directly related to the anterior wall of the external ear canal. Therefore, defects in this wall may lead to herniation of the soft tissues of the temporo-mandibular joint into the external ear canal. Such herniation usually is secondary to external injuries, iatrogenic trauma, neoplasms, and so on, but it may also be congenital. We report a well-documented case of temporo-mandibular joint herniation into the external ear canal of probable congenital origin.

Ear Diseases↗
PubMed1981

Ultrastructure of elastic cartilage in the rat external ear.

The structure of elastic cartilage in the external ear of the rat was investigated by transmission and scanning electron microscopy. The narrow subperichondrial, boundary zone contains predominantly ovoid cells rich in cell organelles: mitochondria, Golgi complex, granular endoplasmic reticulum and small (40--100 nm) vesicles. Scarce glycogen granules and bundles of 6--7 nm cytoplasmic filaments are also present. Deeper in the boundary zone, one or more cytoplasmic lipid droplets appear and cytofilaments become more abundant. Fully differentiated chondrocytes in the central zone of the cartilage plate resemble white adipose cells. They are globular and contain a single, large cytoplasmic lipid droplet. The cytoplasm is reduced to a thin peripheral rim; it contains a flattened nucleus, few cytoplasmic organelles and abundant, densely packed, cytoplasmic filaments. The intercellular matrix is very sparse. The pericellular ring consists of collagen fibrils about 20 nm in diameter and a proteoglycan cartilage matrix in the form of a "stellate reticulum". The complex of these two structures appears in the scanning electron micrographs as a a network of randomly oriented, ca 100 nm thick fibrils. Spaces between pericellular rings of matrix also contain thick elastic fibers or plates, apparently devoid of microfibrils. In scanning electron micrographs elastic fibers could be detected only in a few areas, in which they were not obscured by other constituents of the matrix. Immature forms of elastic fibers, oxytalan (pre-elastic) and elaunin fibers, were found in the perichondrial and boundary zones.

Animals↗
PubMed1990

Malignant melanoma of the external ear.

Twelve patients with primary melanoma of the external ear were treated during a 10-year period. Ten patients were males. Median melanoma depth was 2.1 mm and seven patients had lesions deeper than 2 mm. Eight of 12 lesions were either Clark level IV or V. Six patients had wedge excisions of the primary lesion and all developed recurrent disease (local: three). Six patients underwent wide excision and none developed local recurrence. All patients with primary disease less than 2 mm are alive. Only two of seven patients with lesions deeper than 2 mm have survived. The definitive excision for melanoma of the ear should encompass wide margins despite the cosmetic consequences. Lesser procedures inevitably lead to local recurrence. Melanoma deeper than 2 mm penetration on the ear in our series had a poor prognosis.

Adult↗
PubMed1995

Rare sites of melanoma: melanoma of the external ear.

A small series of melanomas of the external ear is presented. The presentation in general was late and they varied from 2.6 mm to 4.8 mm in thickness. The outcome in most of the patients (9 patients) was bad and within 3 years only 4 survived. The fact that 9 patients remembered having a nevus that suddenly changed to melanoma emphasizes the need for early removal of such nevi.

Aged↗
PubMed1991

Differentiation of the secondary elastic cartilage in the external ear of the rat.

The cartilage in the external ear of the rat belongs to the group of secondary cartilages and it has a unique structural organization. The chondrocytes are transformed into typical adipose cells, the proteoglycan cartilage matrix is reduced to thin capsules around the cells and the rest of the extracellular matrix is occupied by a network of coarse elastic fibers. It appears late in development (16-day fetus) and needs more than one month for final development. The differentiation proceeds in several steps which partly overlap: the appearance of collagen fibrils, elastin fibers, the proteoglycan matrix, and the adipose transformation of chondrocytes. The phenotype of this cartilage and the course of its differentiation are very stable, even in very atypical experimental environmental conditions. The only exceptions are explants in organ culture in vitro and perichondrial regenerates. In these conditions the development of elastic fibers is slow and poor while the production of the proteoglycan matrix is abundant. The resulting cartilage then displays structural characteristics of hyaline cartilage rather than those of the initial elastic one.

Animals↗
PubMed1990

Microsurgical replantation of the external ear.

Cosmetically, the optimal management of the amputated external ear is microsurgical replantation. Although technically demanding, replantation is possible by the experienced surgeon. Success frequently requires the use of vein grafts, heparinization, and the alleviation of venous congestion with medicinal leeches or frequent stab wounds.

Adolescent↗