Angiomatosis is a non-neoplastic condition presenting with little knots of capillaries

Capillary

Capillaries are the smallest of a body's blood vessels and are parts of the microcirculation. They are only 1 cell thick. These microvessels, measuring 5-10 μm in diameter, connect arterioles and venules, and enable the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste...

 in various organs. It consists of many angioma

Angioma

Angiomas are benign tumors derived from cells of the vascular or lymphatic vessel walls or derived from cells of the tissues surrounding these vessels....

s. It is also known as Von Hippel-Lindau Disease

Von Hippel-Lindau disease

Von Hippel–Lindau is a rare, autosomal dominant genetic condition in which hemangioblastomas are found in the cerebellum, spinal cord, kidney and retina. These are associated with several pathologies including renal angioma, renal cell carcinoma and pheochromocytoma...

 and is a rare genetic multi system disorder characterized by the abnormal growth of tumours in the body. Symptoms may include headaches, problems with balance and walking, dizziness, weakness of the limbs, vision problems and high blood pressure. Prognosis depends on the size and location of the tumour, untreated angiomatosis may lead to blindness and/ or permanent brain damage. Death may occur, with complications in the kidney or brain.

These tend to be cavernous hemangiomas, which are sharply defined, sponge-like tumors composed of large, dilated, cavernous vascular spaces.

They often appear in:

• Von Hippel-Lindau disease
  Von Hippel-Lindau disease
  Von Hippel–Lindau is a rare, autosomal dominant genetic condition in which hemangioblastomas are found in the cerebellum, spinal cord, kidney and retina. These are associated with several pathologies including renal angioma, renal cell carcinoma and pheochromocytoma...
  
  
• Bacillary angiomatosis
  Bacillary angiomatosis
  Bacillary angiomatosis is a form of angiomatosis associated with bacteria of the Bartonella genus.-Causes:It is caused by either Bartonella henselae or Bartonella quintana....
  
  
• Klippel-Trenaunay-Weber syndrome
  Klippel-Trénaunay-Weber syndrome
  Klippel-Trénaunay-Weber syndrome, often simply Klippel-Trénaunay syndrome and sometimes angioosteohypertrophy syndrome and hemangiectatic hypertrophy, is a rare congenital medical condition in which blood vessels and/or lymph vessels fail to form properly...
  
  
• Sturge-Weber syndrome
  Sturge-Weber syndrome
  Sturge–Weber syndrome, sometimes referred to as encephalotrigeminal angiomatosis, is a rare congenital neurological and skin disorder. It is one of the phakomatoses and is often associated with port-wine stains of the face, glaucoma, seizures, mental retardation, and ipsilateral leptomeningeal...