Related Experiment Video
Updated: Dec 2, 2025
Mechanical and Controlled PRP Injections in Patients Affected by Androgenetic Alopecia
Published on: January 27, 2018
Atypical Presentation of Congenital Triangular Alopecia: A Case Series in Italy
Michela Starace1, Miriam Anna Carpanese1, Diego Abbenante1
1Department of Experimental, Diagnostic and Specialty Medicine, Division of Dermatology, University of Bologna, Italy.
Background:
Congenital triangular alopecia (CTA) is a benign, asymptomatic, nonprogressive, localized and noncicatricial type of alopecia that is usually first noted during infancy or childhood. The pattern of hair loss is traditionally described as triangular, oval or lancet shaped with apex toward the vertex.
Objective:
We present a case series of CTA located in unusual sites.
Patients And Methods:
We performed trichoscopy in 78 patients with CTA. From this group, we selected 10 individuals (4 males and 6 females) whose disease was not localized on the typical scalp area.
Results:
The alopecic area was located on the occipital region in 5 patients, the parietal region in 4 patients, at the vertex in 1. With trichoscopy, vellus hairs were detected in all patients, and evidence of empty follicles was noticed only in 3 patients.
Conclusions:
In contrast with the preconceived notion that all CTAs are frontotemporal, our case series points out that this disease could be localized in other scalp sites.
More Related Videos
Related Concept Videos
01:11Papillary Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
01:20Accessory Structures of the Skin: Hair Growth and Types