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Dermoscopy of inverted follicular keratosis: study of 12 cases
Author(s) -
Llambrich A.,
Zaballos P.,
Taberner R,
Terrasa F.,
Bañuls J.,
Pizarro A.,
Malvehy J.,
Puig S.
Publication year - 2016
Publication title -
clinical and experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 78
eISSN - 1365-2230
pISSN - 0307-6938
DOI - 10.1111/ced.12832
Subject(s) - keratoacanthoma , infundibulum , pathology , pathognomonic , anatomy , basal cell carcinoma , amelanotic melanoma , biology , basal cell , dermatology , medicine , melanoma , genetics , disease
Summary Background Inverted follicular keratosis ( IFK ) is an uncommon benign tumour of the follicular infundibulum, which is often misdiagnosed clinically as other keratinizing tumours, and commonly diagnosed correctly by histopathology. There are few reports about the dermoscopic findings of this lesion. Aim To evaluate the dermoscopic features of IFK . Methods The dermoscopic structures and patterns in digital dermoscopic images of 12 histopathologically confirmed cases of IFK collected from 5 hospitals in Spain were evaluated. Results A keratoacanthoma ( KA )‐like pattern composed of central keratin surrounded by hairpin vessels in a radial arrangement was the most common pattern in IFK (58.3%). The second most common pattern was composed of a yellowish‐white amorphous central area surrounded by vascular structures in a radial arrangement (33.3%). The remaining case showed a pattern composed of a yellowish‐white amorphous central area with milky red globules. Vascular structures were present in all cases, with a monomorphic pattern in seven cases and a polymorphic pattern in five, mainly with radial arrangement. Arborizing vessels, linear irregular vessels, corkscrew vessels and milky red globules were present in some cases. Conclusions We describe the two main patterns of IFK . Lesions with a KA ‐like pattern are clinically and dermoscopically undistinguishable from KA and squamous cell carcinoma. Cases with a polymorphic vascular pattern could be confused with malignant tumours, including basal cell carcinoma and amelanotic melanoma.