Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0851184 (thinning)
 11,252 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

This paper presents a brief historical review and details of one case of this condition. Terrien's marginal corneal degeneration involves a relatively painless degeneration of the superior corneal stroma, with the most prominent clinical finding being the marked irregular astigmatism which accompanies the corneal thinning.
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PMID:Terrien's marginal corneal degeneration: a case report. 732 3

A 30-year-old man with keratoconus in the right eye had radial keratotomy in the left eye. Two pairs of corneal relaxing incisions (CRIs) were made in the right eye to flatten the central cornea and reduce high astigmatism. The right eye required an enhancement, and two additional arcuate CRIs were made. A corneal ulcer developed in the right eye, with infiltrates in the incision and corneal thinning. Although the second set of CRIs resulted in more regular astigmatism, the corneal thinning and ulcer caused regression at two months postoperatively. A wedge resection was performed to even the irregular astigmatism. The results are presented.
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PMID:Wedge resection in the cone after failed refractive surgery in a patient with keratoconus. 855 30

A 24-year-old man presented with narrow, linear areas of thinning situated horizontally in the upper part of both corneas. These areas were associated with progressive corneal ectasia, causing high degrees of "against the rule" astigmatism. By excising the affected areas, the refractive error was significantly improved in both eyes. Features of the disease suggested that the condition was related to the other ectatic corneal dystrophies.
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PMID:Bilateral linear corneal ectasia. An unusual case and its surgical management. 771 29

We present a case of severe Terrien's marginal degeneration treated with two-step annular lamellar keratoplasty. Both eyes of the patient had peripheral corneal thinning with ectasia around the entire corneal circumference. First, an annular-shaped ectatic lesion was defined and removed, and donor tissue of the same size and shape was sutured on the recipient bed with 10-0 nylon. Four months later, the same operation was performed in the fellow eye. This procedure allows corneal astigmatism to be controlled either by suture removal or resuturing, thereby substantially improving visual acuity. No complications occurred during 1 1/2 years of follow up.
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PMID:Two-step annular tectonic lamellar keratoplasty in severe Terrien's marginal degeneration. 811 98

Keratoconus is a noninflammatory corneal disorder characterized by gradual stromal thinning and astigmatism. Altered degradation of corneal extracellular matrix is a suggested etiology for this disorder. In the present study we established keratocyte cultures from normal and keratoconus corneas and investigated the roles that matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMP, TIMP-2) may play. After chemical modification (reduction and alkylation) to remove the inhibitor and activation of enzyme with p-aminophenylmercuric acetate (APMA), keratoconus-conditioned media displayed a significant increase (p < 0.05) in the total potential gelatinolytic activity when compared with normal culture media treated in a similar manner. Basal levels of gelatinolytic activity in keratoconus culture media (no reduction, alkylation, or APMA treatment), determined by two different assay methods, tended to be about twice that of normal cell cultures. By zymography, both keratoconus and normal cultures showed identical enzyme patterns, which represented MMP-2 (72 kDa) in its proform and, depending on the treatment of the media, varying amounts of activated MMP-2 (65 kDa). This suggests that the increased gelatinolytic activity in keratoconus was not correlated with an increased appearance of either the 65-kDa-activated form of MMP-2 or a new MMP species. In addition, no differences in the amount of MMP-2 were detected that could account for the increased activities in keratoconus cultures. However, a relative decline in the detectable TIMP levels in keratoconus cultures resulted in an apparent three-fold increase in the ratio of MMP-2/TIMP. Northern blots showed no significant changes in mRNA levels for MMP-1, MMP-2, MMP-3, TIMP, or TIMP-2. These data suggest that a possible alteration in the interaction between MMP-2 and TIMP may play a role in the increased gelatinolytic activity seen in keratoconus tissues.
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PMID:Increased gelatinolytic activity in keratoconus keratocyte cultures. A correlation to an altered matrix metalloproteinase-2/tissue inhibitor of metalloproteinase ratio. 815 82

The clinical, genetic, radiological and dermatoglyphic findings of a case showing generalized microdontia associated with an extra maxillary central incisor, hypoplastic maxilla, prognathic mandible, wide-set of the ears, hooked nose, astigmatism, camptodactyly, flexion contractures of the distal interphalangeal joints of the fingers, thinning of the fingers towards the distal end of the palm, and complete webbing of the IVth and Vth toes (syndactyly type III) and short stature were presented.
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PMID:Generalized microdontia and associated anomalies: a clinical, genetic, radiologic and dermatoglyphic study. 861 79

Pellucid marginal corneal degeneration (PMCD) is an uncommon cause of inferior peripheral corneal ectasia, affecting patients between the ages of 20 and 40 years. Although histopathologically it is considered a variant of keratoconus, it differs in that the marked corneal steepening occurs more inferiorly, above a narrow band of corneal stromal thinning concentric to the inferior limbus. Here we present two cases. The first case is a clinically typical bilateral PMCD with a characteristic pattern of irregular against-the-rule astigmatism on corneal topography. The second case had an uncommon presentation of hydrops in a clinically keratoglobic eye which showed a marked steepening of the inferior corneal periphery on corneal topography. The other eye showed both clinically and topographically the features of PMCD. Corneal topography suggested that in the second patient, PMCD may have preceded the development of keratoglobus. Keratoconus, PMCD and keratoglobus are considered to be associated as part of the spectrum of non-inflammatory corneal thinning disorders. However, although the finding of PMCD and keratoconus in fellow eyes has been reported, to the best of our knowledge progression from PMCD to keratoglobus has not previously been shown.
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PMID:Topographic analysis in pellucid marginal corneal degeneration and keratoglobus. 894 96

Ulcerative colitis (Crohn's disease) is a chronic relapsing inflammatory bowel disease of unknown etiology. The most common ocular complications include conjunctivitis and uveitis, particularly iritis. Herein, we describe a patient who had a decrease in visual acuity due to an increasing astigmatism. This was accompanied with a peripheral limbal thinning of the cornea and faint confluent corneal changes. No systemic activity was present during the period that the patient was monitored. Changes of astigmatism were followed up with videokeratography. This apparatus monitors changes in clinical course accurately and makes comparison possible between separate visits.
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PMID:Crohn's colitis and the cornea. 907 38

We present a case of misdiagnosed and inadequately treated necrotizing scleritis leading to ocular complications. Scleral thinning and a marked secondary corneal astigmatism were observed and measured by ultrasound biomicroscopy and corneal topography. The purpose of this case report is to demonstrate the clinical value of additional diagnostic tools, such as ultrasound biomicroscopy and corneal topography and to alert ophthalmologists as to the complications of necrotizing scleritis.
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PMID:Complications of misdiagnosed and inadequately treated necrotizing scleritis studied by ultrasound biomicroscopy and computerized corneal topography. 929 21

We screened family members of monozygotic twins with keratoconus to search for a corneal thinning disorder using clinical, videokeratographic, and pachymetric analyses. The parents had bilateral astigmatism of a symmetric bow-tie pattern with normal videokeratographic and pachymetric indices. The 8-year-old sister had slightly asymmetric astigmatism in both eyes with normal pachymetry values. No family member was suspected of a corneal thinning disorder. We discuss the mode of inheritance of keratoconus in this family.
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PMID:Keratographic analysis of a family with keratoconus in identical twins. 1113 87


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