Cicatricial alopecia: classification and histopathology

Area of Science:

• Dermatology
• Pathology

Background:

• Primary cicatricial alopecias (PCAs) are inflammatory scalp disorders leading to permanent hair loss.
• Diagnosis is complex due to overlapping clinical and histopathological features.

Purpose of the Study:

• To review salient histopathologic findings for diagnosing PCAs.
• To highlight the importance of correlating histology with clinical presentation and adjunctive studies.

Main Methods:

• Review of histopathologic features in primary cicatricial alopecias.
• Discussion of classification based on predominant inflammatory cell type (lymphocytic, neutrophilic, mixed).
• Inclusion of insights from special stains and direct immunofluorescence.

Main Results:

• Histopathology is crucial for identifying characteristic folliculocentric inflammation and follicle destruction.
• Early diagnosis via histology enables timely treatment to prevent irreversible hair loss.
• Overlapping features necessitate correlation with clinical findings for accurate diagnosis.

Conclusions:

• Accurate diagnosis of PCAs relies heavily on expert histopathological interpretation.
• Integrating clinical correlation and adjunctive studies improves diagnostic yield.
• Prompt diagnosis and treatment are essential to manage these challenging hair loss disorders.