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Figure 15.21 Cavernous lymphangioma of the tongue. Large cystic spaces lined by the flattened endothelial cells and containing lymph are
present. Stroma shows scattered collection of lymphocytes.

cells are round to cuboidal cells with scanty cytoplasm involvement is the skin and bones while a closely related
(Fig. 15.22). The intervening connective tissue stroma condition peliosis hepatis is seen in the liver (Chapter 21).
contains some non-myelinated nerve fibres.
Grossly, the lesions on the skin are in the form of variable-
sized red papules.
Arteriovenous Malformations Histologically, lobules of proliferating blood vessels are CHAPTER 15
seen lined by epithelioid endothelial cells having mild
An arteriovenous (AV) malformation is a communication atypia. Mixed inflammatory cell infiltrate with nuclear
between an artery and vein without an intervening capillary debris of neutrophils is present in these areas.
bed. It may be congenital or acquired type. Congenital AV
malformations have thick-walled vessels with hyalinisation The condition is treated with antibiotics.
and calcification. Acquired AV malformations reveal changes
mainly in the veins which are dilated and thick-walled. B. INTERMEDIATE GRADE TUMOURS

Bacillary Angiomatosis and Peliosis Hepatis Haemangioendothelioma
Bacillary angiomatosis is a tumour-like lesion reported in Haemangioendothelioma is a true tumour of endothelial
association with HIV-AIDS with CD4+ T cell counts below cells, the behaviour of which is intermediate between a
100/μl. In fact, it is an opportunistic infection with gram- haemangioma and haemangiosarcoma. It is found most often
negative bacilli of Bartonella genus. Most common site of in the skin and subcutaneous tissue in relation to medium- The Blood Vessels and Lymphatics

Figure 15.22 Glomus tumour. There are blood-filled vascular channels lined by endothelial cells and surrounded by nests and masses of
glomus cells.