Related Experiment Video
Updated: Mar 3, 2026
09:04
Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
15.5K
Vascular twin nevi
Senay Agirgol1, Hatice Nur Ozturk2, Tugba Ozkok Akbulut1
1Dermatology Clinic, Haseki Education and Training Hospital, Aksaray, İstanbul, Turkey.
American Journal of Medical Genetics. Part A
|April 28, 2017
Summary
Vascular twin nevi (VTN) present as a telangiectatic nevus alongside nevus anemicus (NA). This case study highlights a rare instance of twin spotting, a phenomenon potentially explaining the co-occurrence of these vascular anomalies.
Area of Science:
- Dermatology
- Genetics
- Vascular Anomalies
Background:
- Vascular twin nevi (VTN) involve the co-occurrence of a telangiectatic nevus and nevus anemicus (NA).
- Nevus anemicus is a vascular anomaly presenting as localized pale patches due to abnormal blood flow, not melanin.
- Twin spotting is a genetic phenomenon where crossing-over in somatic cells during mitosis leads to adjacent homozygous cell populations.
Purpose of the Study:
- To present a case of combined vascular twin nevi (VTN) and nevus anemicus (NA).
- To illustrate a rare manifestation of the twin spotting phenomenon in a clinical dermatological context.
Main Methods:
- Case report presentation.
- Dermatological examination and photographic documentation.
- Literature review on twin spotting and vascular anomalies.
Main Results:
- A patient presented with a simultaneous occurrence of a telangiectatic nevus and nevus anemicus.
- The observed combination supports the hypothesis that twin spotting can underlie the development of distinct vascular anomalies in close proximity.
Conclusions:
- The presented case provides a rare clinical example of vascular twin nevi and nevus anemicus.
- This finding reinforces the twin spotting phenomenon as a potential mechanism for the simultaneous development of different vascular anomalies.
Related Concept Videos
01:19Veins of Head and Neck
6.4K
The blood drainage from the head and neck is primarily managed by three pairs of veins: the external jugular, internal jugular, and vertebral veins. The external jugular veins drain superficial scalp and face structures, passing over the sternocleidomastoid muscles to empty into the subclavian veins.
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
6.4K
01:26Varicose Veins II: Diagnostic Studies and Interprofessional Care
261
Varicose veins, or varicosities, develop when the valves in the veins, which control blood flow, weaken or damage. It causes blood to pool and the veins to enlarge. Understanding the clinical manifestations, diagnostic approaches, and management options for varicose veins is crucial for effective treatment and relief.Clinical manifestationsClinical manifestations of varicose veins include a heavy, achy feeling or pain after prolonged standing or sitting. This discomfort can often be relieved by...
261
01:20Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies
400
The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
400
01:26Varicose Veins I: Introduction
284
Varicose veins, or varicosities, are abnormally dilated and twisted superficial veins caused by venous valve incompetence. This condition commonly affects the lower extremities, especially the saphenous veins, due to the higher pressure from prolonged standing and walking. However, varicosities can also occur in other areas, such as the esophagus, vulva, spermatic cords, and anorectal region.Etiology and typesPrimary varicose veins, often idiopathic, are more common in women due to inherent...
284
01:15Thoracic Aorta
2.0K
The thoracic section of the aorta begins at the T5 vertebra and extends to the T12 level at the diaphragm, initially progressing through the mediastinum to the left of the spinal column. Throughout its course in the thoracic segment, the thoracic aorta emits various offshoots known collectively as visceral and parietal branches. The branches that predominantly supply blood to visceral organs are termed visceral branches and include bronchial, pericardial, esophageal, and mediastinal arteries,...
2.0K
01:11Papillary Dermis
6.4K
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...
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...
6.4K