Oral medicine
Correlation between clinical and histopathologic diagnoses of oral lichen planus based on modified WHO diagnostic criteria

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Objective

We studied the correlation between the clinical and histopathologic diagnoses of oral lichen planus (OLP) based on the modified World Health Organization (WHO) diagnostic criteria (2003).

Study design

First, 4 oral pathologists and 4 clinicians reviewed and categorized 62 microscopic slides and clinical photographs based on WHO 1978 criteria, and then based on modified WHO definition. The number of photographs and microscopic slides in which all clinicians and all pathologists agreed were calculated and compared.

Results

Based on 1978 criteria, in 68% of cases in which all clinicians agreed about the diagnosis of OLP, all pathologists agreed about the diagnosis of OLP. Conversely, in 79% of cases in which all pathologists agreed on the diagnosis of OLP, all clinicians agreed on the diagnosis of OLP. Based on modified criteria, in 93.87% of cases in which all clinicians agreed on the diagnosis of OLP, all pathologists agreed on the diagnosis of OLP. Similarly, in 95.83% of the cases in which all pathologists agreed about the diagnosis of OLP, all clinicians agreed about the diagnosis of OLP.

Conclusion

Results show higher clinicopathologic correlation in the diagnosis of OLP based on the modified criteria of OLP compared with the 1978 criteria.

Section snippets

Material and Methods

This study was approved by The Ethics Committee of Research Project in Kerman University of Medical Sciences. The study involved the review of clinical photographs and histological slide specimens.

Microscopic slides and clinical and historical records of patients with oral white lesions were obtained from the files of the Departments of Oral Medicine and Pathology of the Kerman University of Medical Sciences, Iran. Seventy-one microscopic slides were collected by an investigator who did not

Results

Seventy-one pathologic slides were retrieved; clinical photographs were available for 62 of the cases. Pathologic slides consisted of 50 patients with OLP and OLL lesions. Of the 50 slides, 35 (70%) were OLP and 15 (30%) were OLL. Twenty-one cases were other oral white lesions (i.e., 17 cases were leukoplakia and 3 cases were squamous cell carcinoma). Photographs included 47 cases of OLP and 15 cases with other oral white lesions. Of the 71 cases, 41 cases were females and 30 were males. The

Discussion

In this study, the 1978 WHO criteria for the diagnosis of OLP were compared with the modified WHO criteria of 2003. Interobserver and intraobserver variability in clinical and pathologic evaluations were assessed by calculation of unweighted kappa scores. The grading of kappa values were categorized as follows: kappa <0.40 = poor agreement, 0.41< kappa <0.60 = moderate agreement, 0.61< kappa <0.80 = substantial agreement, kappa >0.81 = good agreement.16 Results showed that based on the 1978

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    Citation Excerpt :

    The demographic characteristics of the 2 groups are summarized in Table I. The OLP patients were clinically and histologically diagnosed according to the 2003 WHO diagnostic criteria18 by 2 pathologists independently. The inclusion criteria were as follows1: no other dental diseases, no oral mucosal diseases or other infectious diseases, and no history of orthodontic treatment2; not taking antibiotics, immunomodulatory drugs, and other drugs that may affect the immune function in the last 3 months3; and no surgical treatment for oral diseases within 1 year.

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This work was supported by Research Center of Kerman Medical Science.

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