Significance of histopathological classification in leprosy

Area of Science:

• Dermatology
• Pathology

Background:

• Leprosy classification is crucial for treatment and prognosis.
• The Ridley and Jopling criteria are widely used for leprosy classification.
• Histopathological and clinical classifications may differ, impacting patient management.

Purpose of the Study:

• To correlate histopathological and clinical classifications of leprosy.
• To evaluate the agreement between the Ridley and Jopling criteria in a large patient cohort.
• To identify discrepancies in leprosy classification between histopathological and clinical assessments.

Main Methods:

• Retrospective blind study of 2640 leprosy patients.
• Correlation of histopathological and clinical leprosy classifications.
• Application of Ridley and Jopling criteria for assessment.

Main Results:

• Complete agreement between histopathological and clinical classifications observed in 81.8% of cases.
• One-step deviation in classification occurred in 5.1% of cases.
• Histopathological diagnosis identified a higher percentage of indeterminate leprosy (15.9%) compared to clinical diagnosis (3.3%).
• High type-wise correlation was noted: LL (98%), TT (97%), BT (95%), BB (89%), and BL (87%).

Conclusions:

• Histopathological classification shows high concordance with clinical assessment in leprosy.
• Histopathology is valuable for identifying indeterminate leprosy, often missed clinically.
• The Ridley and Jopling criteria demonstrate robust correlation across various leprosy types.