الفهرس 
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Abstract
This work was done to study the dermoscopic features of tinea capitis and to evaluate the diagnostic accuracy of trichoscopy in Tinea capitis. This study was carried out on 100 subjects with area(s) of hair loss suspected clinically as tinea capitis,they were collected from the outpatient Clinic of Dermatology, Andrology and STDs of Mansoura University Hospital. All the patients were subjected to complete history taking, clinical examination of scalp and hair, Woods light examination. Skin scrapings and infected hair shafts were examined using microscopic examination (KOH preparation) and culture on sabouraud’s dextrose agar medium. Dermosopic imaging of scalp lesions was performed using the dermoscope (Dermlite II) with photographic imaging. The typical trichoscopic signs of tinea capitis were detected in 78% of the cases. The most common specific trichoscopic sign of TC were whitish sheath around proximal hair shaft, followed by comma hairs, then corkscrow hairs, morse-code hairs, zigzag hairs, bent hair and i-hairs. Comma hairs, corkscrow hairs, Morse-code hairs, zigzag hairs and whitish sheath around proximal hair shaft were detected significantly more in the Positive culture group with positive predictive values of 92.2%, 94.6%, 94.4%, 91.2%, 92.9 % respectively. Sensitivity was 64.4%, 47.9%, 46.6%, 42.5%, 71.2% and specificity was 85.2%, 92.6%, 92.6%, 88.9%, 85.2%, respectively. Using culture as a gold standard in diagnosing tinea capitis, the sensitivity of the trichoscopy assessment was 97.3%, specificity was 74.1%, positive predictive value (PPV) was 94.4% and negative predictive value (NPV) was 90.9%, with 91% diagnostic accuracy. The use of trichoscopy greatly enhances the physician’s ability to make an immediate decision about the starting oral antifungal therapy without delay. Trichoscopic examination has higher sensitivity (97.3% vs 65.8%) and higher diagnostic accuracy (91% vs 72 %) in comparison to KOH examination in diagnosing tinea capitis. Comma hairs, corkscrew hairs, morse code- hairs, zigzag hairs, bent hairs, i-hairs and whitish sheath are characteristic trichoscopic markers of tinea capitis with high specificity. Those trichoscopic signs could be considered as predictors for diagnosis of TC.