Search Results for: arteriovenous shunt

Therapeutic Strategies in Dermatology

Vascular Birthmarks: Key Points

…rmations). Vascular malformations may be comprised of venous, arteriovenous, capillary, or mixed components; careful examination for an arterial component and for extensive subcutaneous involvement may prompt radiographic imaging as an essential step…

A Clinical Atlas of 101 Common Skin Diseases

Hemangiomas, Vascular Malformations, and Ectasias

An hemangioma is a benign neoplasm of blood vessels, a vascular malformation is an aberration in development of one or more major vascular structures, and an ectasia is a dilation of a preexisting end vessel.

Histologic Diagnosis of Inflammatory Skin Diseases

Acroangiodermatitis of Mali/Stewart-Bluefarb syndrome

…of purple nodules on a limb as a consequence of an underlying arteriovenous malformation. Similar changes occur on upper limbs of patients on hemodialysis as a consequence of an arteriovenous fistula. Differential diagnosis clinical Kaposi’s sa…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Angiolymphoid Hyperplasia with Eosinophilia/Kimura’s Disease?

…undamentally is a manifestation of a malformation, to wit, an arteriovenous shunt seated in the subcutaneous fat or even deeper in the subcutis. Although expressions morphologic of angiolymphoid hyperplasia may involve the dermis alone, the subcutane…

Histologic Diagnosis of Inflammatory Skin Diseases

Confusing Terms (to be Avoided Scrupulously)

…in structure of blood vessels, such as a malformation (e.g., arteriovenous shunt), and an ectasia (e.g., Osler-Weber-Rendu syndrome). For these reasons, there is no need ever to employ the term vasculopathy; the particular pathologic process that in…

Differential Diagnosis in Dermatopathology

Discussions

…a vascular malformation that comes into being by virtue of an arteriovenous shunt, angiosarcoma is a malignant neoplasm with blood vascular differentiation. Although clinically and biologically the two conditions are very different from one another,…

Differential Diagnosis in Dermatopathology

Angiolymphoid hyperplasia with eosinophilia vs. Angiosarcoma

An hemangioma is a benign neoplasm of blood vessels, a vascular malformation is an aberration in development of one or more major vascular structures, and an ectasia is a dilation of a preexisting end vessel.

Histologic Diagnosis of Inflammatory Skin Diseases

Blood Vessels

…osphatase preparation.) (Courtesy of William Montagna, Ph.D.) Arteriovenous anastomoses, known as Sucquet-Hoyer canals, are present in skin of the digits especially (Fig. 1.77). Those specialized segments are surrounded by three to six rows of unifor…

Histologic Diagnosis of Inflammatory Skin Diseases

Nail Units

…highly vascular, especially in papillae. In addition, special arteriovenous shunts, known as Sucquet-Hoyer canals and lined by endothelial cells that, in turn, are rimmed by glomus cells, are present in the dermis. They help to regulate temperature o…