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Anthony J. Aldave - One of the best experts on this subject based on the ideXlab platform.

  • a multicenter study to map genes for fuchs endothelial Corneal Dystrophy baseline characteristics and heritability
    Cornea, 2012
    Co-Authors: Megan D Louttit, Anthony J. Aldave, Laura J Kopplin, Jeremy Fondran, Angela Tagliaferri, David S Bardenstein, Christopher R Croasdale, Marianne O Price, George O D Rosenwasser, Jonathan H Lass
    Abstract:

    Purpose:To describe the methods for family and case–control recruitment for a multicenter genetic and associated heritability analyses of Fuchs endothelial Corneal Dystrophy (FECD).Methods:Twenty-nine enrolling sites with 62 trained investigators and coordinators gathered individual and family infor

  • classic lattice Corneal Dystrophy associated with monoclonal gammopathy after exclusion of a tgfbi mutation
    Cornea, 2009
    Co-Authors: Khairidzan M Kamal, Sylvia A. Rayner, Michael C Chen, Anthony J. Aldave
    Abstract:

    Classic and variant lattice Corneal dystrophies are manifestations of primary localized Corneal amyloidosis associated with a number of mutations in the transforming growth factor beta induced (TGFBI) gene on chromosome 5q31.1 Traditionally, the diagnosis has been made based on characteristic clinical features and a positive family history. However, several reports of non-dystrophic, localized causes of Corneal lattice lines published in the last several years have highlighted the usefulness of genetic testing to differentiate between dystrophic and non-dystrophic disorders demonstrating phenotypic features previously associated only with classic lattice Corneal Dystrophy.2, 3 We report a case of a patient demonstrating clinical features characteristic of classic lattice Corneal Dystrophy in which screening of TGFBI excluded the possibility of a previously described or novel coding region mutation. Evaluation for systemic disorders associated with systemic amyloidosis revealed a monoclonal gammopathy of undetermined significance (MGUS), which we report in association with a pseudo-classic lattice Corneal Dystrophy phenotype.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20
    Genetics in Medicine, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Eric Sobel, Anthony J. Aldave
    Abstract:

    Purpose: The study purpose was to identify the genetic basis of posterior polymorphous Corneal Dystrophy, an autosomal dominant disorder of the Corneal endothelium that is associated with the development of Corneal edema, necessitating Corneal transplantation for visual rehabilitation. Glaucoma also develops in up to 40% of patients with posterior polymorphous Corneal Dystrophy. Methods: Linkage analysis, using microsatellite markers previously used to demonstrate linkage of posterior polymorphous Corneal Dystrophy to the chromosome 20 candidate region known as posterior polymorphous Corneal Dystrophy 1, was performed in 29 members of a family with posterior polymorphous Corneal Dystrophy. Thirty-four microsatellite markers were used to refine the posterior polymorphous Corneal Dystrophy 1 interval. TCF8 , located on chromosome 10, was screened in an affected family member to exclude posterior polymorphous Corneal Dystrophy 3. Results: Significant evidence of linkage to the posterior polymorphous Corneal Dystrophy 1 interval was obtained with both single-point and multipoint analyses. The largest single-point log odds ratio score obtained was 4.38 (θ = 0) at marker D20S471; within 4.7 Mbp (7.2 cM) of D20S471 eight markers provided single-point log odds ratio scores of greater than 3.00 and three markers provided single-point log odds ratio scores greater than 4.00. The largest multipoint log odds ratio score obtained was 4.83, found across the adjacent markers D20S844, D20S191, D20S484, and D20S111. The support interval for posterior polymorphous Corneal Dystrophy 1 in the family we report is approximately 13.5 Mbp (10 cM) long and lies between the markers D20S182 and D20S195. Eleven markers have multipoint log odds ratio scores greater than 4.0 within this region. No coding region mutations were identified in TCF8 in an affected member of the family, effectively excluding posterior polymorphous Corneal Dystrophy 3. Conclusions: The originally described 19.8 cM posterior polymorphous Corneal Dystrophy 1 candidate disease interval has been refined to a 10 cM interval between markers D20S182 and D20S195. A portion of this refined interval overlaps a more recently reported posterior polymorphous Corneal Dystrophy 1 interval, with only 20 known and predicted genes mapped to the 2.4 cM common interval.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20.
    Genetics in medicine : official journal of the American College of Medical Genetics, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, Eric M. Sobel, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Anthony J. Aldave
    Abstract:

    Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20

  • Anterior basement membrane Corneal Dystrophy and pseudo-unilateral lattice Corneal Dystrophy in a patient with recurrent Corneal erosions ☆
    American journal of ophthalmology, 2004
    Co-Authors: Anthony J. Aldave, Vivek S. Yellore, Danny Y. Lin, Alexandre H. Principe, Barry A. Weissman
    Abstract:

    Abstract Purpose To report the utility of genetic testing in the diagnosis and management of patients with suspected Corneal dystrophies. Design Case report. Methods A 58-year-old man with a history of recurrent Corneal erosions was diagnosed with bilateral anterior basement membrane Dystrophy and unilateral lattice Corneal Dystrophy. All 17 exons of the TGFBI gene were screened for mutations previously associated with lattice Corneal Dystrophy as well as novel coding region changes. Results No mutations were found in the 17 exons of the TGFBI gene. A nucleotide change in exon 6 (651C>G) did not result in a change in the encoded amino acid (Leu217Leu). Conclusions In cases of suspected TGFBI Corneal dystrophies, genetic testing is a useful tool to confirm the clinical diagnosis. In this case of suspected unilateral lattice Corneal Dystrophy, screening of the TGFBI gene ruled out the diagnosis, raising the possibility that the Corneal changes were related to the coexistent anterior basement membrane Dystrophy.

Shigeru Kinoshita - One of the best experts on this subject based on the ideXlab platform.

  • rho associated kinase inhibitor eye drop treatment as a possible medical treatment for fuchs Corneal Dystrophy
    Cornea, 2013
    Co-Authors: Noriko Koizumi, Naoki Okumura, Morio Ueno, Hiroko Nakagawa, Junji Hamuro, Shigeru Kinoshita
    Abstract:

    Purpose:To report a case of Fuchs Corneal Dystrophy that was successfully treated by Rho-associated kinase (ROCK) inhibitor eye drops, subsequent to transCorneal freezing of damaged Corneal endothelial cells.Methods:A 52-year-old Japanese man with a diagnosis of late-onset Fuchs Corneal Dystrophy wa

  • clinical outcomes of phototherapeutic keratectomy in eyes with thiel behnke Corneal Dystrophy
    American Journal of Ophthalmology, 2013
    Co-Authors: Osamu Hieda, Satoshi Kawasaki, Kouichi Wakimasu, Kenta Yamasaki, Tsutomu Inatomi, Shigeru Kinoshita
    Abstract:

    Purpose To investigate the functional and morphologic midterm outcome of phototherapeutic keratectomy (PTK) for Thiel-Behnke Corneal Dystrophy diagnosed by gene-mutation analysis. Design Retrospective, single-center clinical study. Methods Between July 2001 and May 2010, 10 consecutive PTKs were performed in 10 eyes of 5 patients (2 male, 3 female; mean age: 55 ± 13 years) with superficially accentuated opacities caused by Thiel-Behnke Corneal Dystrophy and were followed up for at least 12 months (range: 12–108 months). Main outcome measures included (1) best-corrected visual acuity (BCVA), (2) uncorrected visual acuity (UCVA), (3) spherical equivalent, and (4) recurrence rate. The probability of recurrence of Thiel-Behnke Corneal Dystrophy after PTK was calculated using the Kaplan-Meier method for survival analysis. Results The p.Arg555Gln mutation was found within the TGFBI gene in all 5 patients. Average logarithm of minimal angle of resolution (logMAR) BCVA change was −0.55 ± 0.26. Average logarithm UCVA change was −0.54 ± 0.31. In 5 of the 10 eyes, recurrence of central superficial opacification was clinically identified during the follow-up periods, and in 4 of those 5 eyes, the level of the recurrence was so significant that the visual acuity was reduced more than 2 lines. The maximum follow-up period of the 1 eye without significant post-PTK recurrence was 108 months. Conclusions PTK is a successful therapy for Thiel-Behnke Corneal Dystrophy, and results in midterm stable visual acuity and Corneal transparency. Unlike in Reis-Bucklers Corneal Dystrophy cases, PTK delays the need for more invasive surgical intervention in Thiel-Behnke Corneal Dystrophy.

  • Gelatino-lattice Corneal Dystrophy: clinical features and mutational analysis.
    American journal of ophthalmology, 2000
    Co-Authors: Takahiro Nakamura, Kohji Nishida, Atsuyoshi Dota, Wakako Adachi, Shuji Yamamoto, Naoyuki Maeda, Masaki Okada, Shigeru Kinoshita
    Abstract:

    Abstract PURPOSE: To report five unrelated Japanese individuals with “gelatino-lattice” Corneal Dystrophy that clinically resembled, to some extent, gelatinous drop-like Corneal Dystrophy and lattice Corneal Dystrophy type 1. METHODS: Genomic DNA isolated from the five individuals with “gelatino-lattice” Corneal Dystrophy was used as a template for polymerase chain reaction to amplify all exons of the candidate gene βig-h3 and M1S1. The polymerase chain reaction product was then sequenced. RESULTS: In all cases, βig-h3 was mutated in “gelatino-lattice” Corneal Dystrophy (Arg124Cys), which is the same nucleotide change examined previously in lattice Corneal Dystrophy type 1. On the other hand, no mutation was detected in the entire coding region of M1S1. CONCLUSION: Based on the results of this study, it is suggested that “gelatino-lattice” Corneal Dystrophy may be a subtype of lattice Corneal Dystrophy type 1.

  • Granular Corneal Dystrophy with homozygous mutations in the kerato-epithelin gene
    American journal of ophthalmology, 1998
    Co-Authors: Masaki Okada, Kohji Nishida, Shuji Yamamoto, Naoyuki Maeda, Shigeru Kinoshita, Hitoshi Watanabe, Yoshitsugu Inoue, Motokazu Tsujikawa, Yoshikazu Shimomura, Yasuo Tano
    Abstract:

    Abstract PURPOSE: To report a family with several members affected with granular Corneal Dystrophy Groenouw type 1. Three members of the family were affected with a severe placoid type of Corneal Dystrophy. To determine the relationship between gene mutations and phenotypic variations of the disease, we analyzed the kerato-epithelin gene. METHODS: The pedigree included a consanguineous marriage of two affected individuals. The three family members affected with a severe form of Corneal Dystrophy were offspring of these parents. However, the phenotype of other affected family members was typical granular Corneal Dystrophy. We isolated genomic DNA from leukocytes of the family members. Exons of the kerato-epithelin gene were amplified by the polymerase chain reaction and were analyzed using the single-strand conformation polymorphism technique. Mutations were identified by direct sequencing method and restriction digestion analysis. RESULTS: The three severely affected family members exhibited homozygous mutations at codon 555 (arginine to tryptophan) in the kerato-epithelin gene, whereas those with typical granular Corneal Dystrophy had the heterozygous mutation at the same codon. Unaffected family members did not have the mutation. CONCLUSIONS: We determined that the severe phenotype of granular Corneal Dystrophy is caused by homozygous mutations in the kerato-epithelin gene. Clinical manifestation of the severe phenotype is a placoid type of Corneal Dystrophy and early recurrence after surgery. Granular Corneal Dystrophy appears to be the first ophthalmic disease in which homozygosity for a dominant allele has been genetically identified.

  • Gelatinous drop-like Corneal Dystrophy is not one of the βig-h3–mutated Corneal amyloidoses
    American journal of ophthalmology, 1998
    Co-Authors: Atsuyoshi Dota, Kohji Nishida, Wakako Adachi, Yoichi Honma, Satoshi Kawasaki, Andrew J. Quantock, Shigeru Kinoshita
    Abstract:

    Abstract PURPOSE: To discover if βig-h3 is mutated in gelatinous drop-like Corneal Dystrophy, as has been suggested. METHODS: Genomic DNA was isolated from unrelated individuals with lattice Corneal Dystrophy type I (n = 3), Avellino Corneal Dystrophy (n = 3), and gelatinous drop-like Corneal Dystrophy (n = 3) and used as a template for polymerase chain reaction to amplify all exons in βig-h3. The polymerase chain reaction product was then sequenced. RESULTS: βig-h3 is mutated in lattice Corneal Dystrophy type I (Arg124Cys) and Avellino Corneal Dystrophy (Arg124His). In gelatinous drop-like Corneal Dystrophy, on the other hand, no mutation was detected in the entire coding region of βig-h3 (all 17 exons). CONCLUSION: Unlike the amyloidotic Corneal dystrophies lattice type I and Avellino, gelatinous drop-like Corneal Dystrophy is not likely to be caused by a mutation in βig-h3.

Vivek S. Yellore - One of the best experts on this subject based on the ideXlab platform.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20
    Genetics in Medicine, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Eric Sobel, Anthony J. Aldave
    Abstract:

    Purpose: The study purpose was to identify the genetic basis of posterior polymorphous Corneal Dystrophy, an autosomal dominant disorder of the Corneal endothelium that is associated with the development of Corneal edema, necessitating Corneal transplantation for visual rehabilitation. Glaucoma also develops in up to 40% of patients with posterior polymorphous Corneal Dystrophy. Methods: Linkage analysis, using microsatellite markers previously used to demonstrate linkage of posterior polymorphous Corneal Dystrophy to the chromosome 20 candidate region known as posterior polymorphous Corneal Dystrophy 1, was performed in 29 members of a family with posterior polymorphous Corneal Dystrophy. Thirty-four microsatellite markers were used to refine the posterior polymorphous Corneal Dystrophy 1 interval. TCF8 , located on chromosome 10, was screened in an affected family member to exclude posterior polymorphous Corneal Dystrophy 3. Results: Significant evidence of linkage to the posterior polymorphous Corneal Dystrophy 1 interval was obtained with both single-point and multipoint analyses. The largest single-point log odds ratio score obtained was 4.38 (θ = 0) at marker D20S471; within 4.7 Mbp (7.2 cM) of D20S471 eight markers provided single-point log odds ratio scores of greater than 3.00 and three markers provided single-point log odds ratio scores greater than 4.00. The largest multipoint log odds ratio score obtained was 4.83, found across the adjacent markers D20S844, D20S191, D20S484, and D20S111. The support interval for posterior polymorphous Corneal Dystrophy 1 in the family we report is approximately 13.5 Mbp (10 cM) long and lies between the markers D20S182 and D20S195. Eleven markers have multipoint log odds ratio scores greater than 4.0 within this region. No coding region mutations were identified in TCF8 in an affected member of the family, effectively excluding posterior polymorphous Corneal Dystrophy 3. Conclusions: The originally described 19.8 cM posterior polymorphous Corneal Dystrophy 1 candidate disease interval has been refined to a 10 cM interval between markers D20S182 and D20S195. A portion of this refined interval overlaps a more recently reported posterior polymorphous Corneal Dystrophy 1 interval, with only 20 known and predicted genes mapped to the 2.4 cM common interval.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20.
    Genetics in medicine : official journal of the American College of Medical Genetics, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, Eric M. Sobel, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Anthony J. Aldave
    Abstract:

    Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20

  • Anterior basement membrane Corneal Dystrophy and pseudo-unilateral lattice Corneal Dystrophy in a patient with recurrent Corneal erosions ☆
    American journal of ophthalmology, 2004
    Co-Authors: Anthony J. Aldave, Vivek S. Yellore, Danny Y. Lin, Alexandre H. Principe, Barry A. Weissman
    Abstract:

    Abstract Purpose To report the utility of genetic testing in the diagnosis and management of patients with suspected Corneal dystrophies. Design Case report. Methods A 58-year-old man with a history of recurrent Corneal erosions was diagnosed with bilateral anterior basement membrane Dystrophy and unilateral lattice Corneal Dystrophy. All 17 exons of the TGFBI gene were screened for mutations previously associated with lattice Corneal Dystrophy as well as novel coding region changes. Results No mutations were found in the 17 exons of the TGFBI gene. A nucleotide change in exon 6 (651C>G) did not result in a change in the encoded amino acid (Leu217Leu). Conclusions In cases of suspected TGFBI Corneal dystrophies, genetic testing is a useful tool to confirm the clinical diagnosis. In this case of suspected unilateral lattice Corneal Dystrophy, screening of the TGFBI gene ruled out the diagnosis, raising the possibility that the Corneal changes were related to the coexistent anterior basement membrane Dystrophy.

Sylvia A. Rayner - One of the best experts on this subject based on the ideXlab platform.

  • classic lattice Corneal Dystrophy associated with monoclonal gammopathy after exclusion of a tgfbi mutation
    Cornea, 2009
    Co-Authors: Khairidzan M Kamal, Sylvia A. Rayner, Michael C Chen, Anthony J. Aldave
    Abstract:

    Classic and variant lattice Corneal dystrophies are manifestations of primary localized Corneal amyloidosis associated with a number of mutations in the transforming growth factor beta induced (TGFBI) gene on chromosome 5q31.1 Traditionally, the diagnosis has been made based on characteristic clinical features and a positive family history. However, several reports of non-dystrophic, localized causes of Corneal lattice lines published in the last several years have highlighted the usefulness of genetic testing to differentiate between dystrophic and non-dystrophic disorders demonstrating phenotypic features previously associated only with classic lattice Corneal Dystrophy.2, 3 We report a case of a patient demonstrating clinical features characteristic of classic lattice Corneal Dystrophy in which screening of TGFBI excluded the possibility of a previously described or novel coding region mutation. Evaluation for systemic disorders associated with systemic amyloidosis revealed a monoclonal gammopathy of undetermined significance (MGUS), which we report in association with a pseudo-classic lattice Corneal Dystrophy phenotype.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20
    Genetics in Medicine, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Eric Sobel, Anthony J. Aldave
    Abstract:

    Purpose: The study purpose was to identify the genetic basis of posterior polymorphous Corneal Dystrophy, an autosomal dominant disorder of the Corneal endothelium that is associated with the development of Corneal edema, necessitating Corneal transplantation for visual rehabilitation. Glaucoma also develops in up to 40% of patients with posterior polymorphous Corneal Dystrophy. Methods: Linkage analysis, using microsatellite markers previously used to demonstrate linkage of posterior polymorphous Corneal Dystrophy to the chromosome 20 candidate region known as posterior polymorphous Corneal Dystrophy 1, was performed in 29 members of a family with posterior polymorphous Corneal Dystrophy. Thirty-four microsatellite markers were used to refine the posterior polymorphous Corneal Dystrophy 1 interval. TCF8 , located on chromosome 10, was screened in an affected family member to exclude posterior polymorphous Corneal Dystrophy 3. Results: Significant evidence of linkage to the posterior polymorphous Corneal Dystrophy 1 interval was obtained with both single-point and multipoint analyses. The largest single-point log odds ratio score obtained was 4.38 (θ = 0) at marker D20S471; within 4.7 Mbp (7.2 cM) of D20S471 eight markers provided single-point log odds ratio scores of greater than 3.00 and three markers provided single-point log odds ratio scores greater than 4.00. The largest multipoint log odds ratio score obtained was 4.83, found across the adjacent markers D20S844, D20S191, D20S484, and D20S111. The support interval for posterior polymorphous Corneal Dystrophy 1 in the family we report is approximately 13.5 Mbp (10 cM) long and lies between the markers D20S182 and D20S195. Eleven markers have multipoint log odds ratio scores greater than 4.0 within this region. No coding region mutations were identified in TCF8 in an affected member of the family, effectively excluding posterior polymorphous Corneal Dystrophy 3. Conclusions: The originally described 19.8 cM posterior polymorphous Corneal Dystrophy 1 candidate disease interval has been refined to a 10 cM interval between markers D20S182 and D20S195. A portion of this refined interval overlaps a more recently reported posterior polymorphous Corneal Dystrophy 1 interval, with only 20 known and predicted genes mapped to the 2.4 cM common interval.

  • Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20.
    Genetics in medicine : official journal of the American College of Medical Genetics, 2007
    Co-Authors: Vivek S. Yellore, Jeanette C. Papp, Eric M. Sobel, M. Ali Khan, Sylvia A. Rayner, Debora B. Farber, Anthony J. Aldave
    Abstract:

    Replication and refinement of linkage of posterior polymorphous Corneal Dystrophy to the posterior polymorphous Corneal Dystrophy 1 locus on chromosome 20

Petra Liskova - One of the best experts on this subject based on the ideXlab platform.

  • CUGC for posterior polymorphous Corneal Dystrophy (PPCD)
    European Journal of Human Genetics, 2020
    Co-Authors: Alice E. Davidson, Lubica Dudakova, Nathaniel J. Hafford-tear, Amanda N. Sadan, Nikolas Pontikos, Alison J. Hardcastle, Stephen J. Tuft, Petra Liskova
    Abstract:

    Name of the disease (synonyms) CUGC for posterior polymorphous Corneal Dystrophy (PPCD). OMIM# of the disease 122000; 609141; 618031. Name of the analysed genes or DNA/chromosome segments OVOL2 (PPCD1); ZEB1 (PPCD3); GRHL2 (PPCD4). OMIM# of the gene(s) 616441; 189909; 608576. Review of the analytical and clinical validity as well as of the clinical utility of DNA-based testing for variants in the OVOL2, ZEB1 and GRHL2 gene(s) in a diagnostic setting, predictive and parental settings and for risk assesment in relatives.

  • Coincidental Occurrence of Schnyder Corneal Dystrophy and Posterior Polymorphous Corneal Dystrophy Type 3.
    Cornea, 2019
    Co-Authors: Lubica Dudakova, Pavlina Skalicka, Alice E. Davidson, Petra Liskova
    Abstract:

    PURPOSE To report a simultaneous occurrence of 2 rare Corneal dystrophies. METHODS A 30-year-old man with a family history of posterior polymorphous Corneal Dystrophy type 3 (PPCD3) was invited for ophthalmic examination. Sanger sequencing of the coding regions and intron/exon boundaries of disease-associated genes, ZEB1 and UBIAD1, was performed. RESULTS The clinical findings suggested co-occurrence of PPCD3 and Schnyder Corneal Dystrophy in the proband. This dual diagnosis was supported by genetic findings. He was identified to carry a previously reported heterozygous nonsense mutation in ZEB1: c.2157C>G; p.(Tyr719*), and a novel heterozygous missense mutation in UBIAD1: c.569T>C; p.(Ile190Thr). The mother of the proband only carried c.2157C>G in ZEB1, and slit-lamp examination of her corneas showed endothelial lesions characteristic of PPCD3. The sister of the proband carried c.569T>C in UBIAD1 and had Corneal crystal deposition in her anterior stroma consistent with the diagnosis of Schnyder Corneal Dystrophy. CONCLUSIONS This case illustrates the coincidental occurrence of 2 rare and genetically distinct Corneal dystrophies in a single patient. Furthermore, it highlights the need to perform comprehensive phenotyping in combination with appropriate genetic diagnostic testing to achieve an accurate diagnosis.