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Related Concept Videos

Overview of the Vascular System01:20

Overview of the Vascular System

The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Tumor Progression02:07

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
Mechanism of Angiogenesis01:10

Mechanism of Angiogenesis

Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
Veins of Head and Neck01:19

Veins of Head and Neck

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...

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Update on vascular neoplasms.

Omar P Sangüeza1

  • 1Department of Pathology, Wake Forest University School of Medicine, Winston Salem, NC 27157, USA. osanguez@wakehealth.edu

Dermatologic Clinics
|October 2, 2012
PubMed
Summary
This summary is machine-generated.

This update reviews new diagnostic tools for vascular neoplasms, including infantile hemangiomas and Kaposi sarcoma variants. It explores novel immunohistochemical markers to improve the identification of various vascular tumors.

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Area of Science:

  • Pathology
  • Oncology
  • Dermatology

Background:

  • Vascular neoplasms encompass a diverse group of tumors and tumor-like conditions.
  • Accurate diagnosis is crucial for appropriate patient management and treatment.
  • Advances in immunohistochemistry offer new avenues for precise classification.

Purpose of the Study:

  • To provide an updated overview of vascular neoplasms.
  • To highlight novel immunohistochemical markers for diagnostic enhancement.
  • To discuss recent findings in specific vascular tumor types.

Main Methods:

  • Review of current literature and diagnostic criteria for vascular neoplasms.
  • Exploration of newly developed immunohistochemical markers.
  • Analysis of histopathologic variants and differential diagnoses.

Main Results:

  • Introduction of new immunohistochemical markers for diagnosing various vascular neoplasms.
  • Detailed examination of infantile hemangiomas and their specific markers.
  • Discussion of acquired elastotic hemangiomas and radiation-induced vascular proliferations.
  • Identification of new histopathologic variants of acquired immunodeficiency syndrome-related Kaposi sarcoma.

Conclusions:

  • Novel immunohistochemical markers significantly improve the diagnostic accuracy of vascular neoplasms.
  • Understanding new variants and specific tumor types enhances clinical practice.
  • This update aids pathologists and clinicians in managing complex vascular lesions.