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What is Bacillary angiomatosis and explain in detail?
Bacillary angiomatosis (BA) is a form of angiomatosis associated with bacteria of the genus Bartonella.

Symptoms
Cutaneous BA is characterised by the presence of lesions on or under the skin. Appearing in numbers from one to hundreds, these lesions may take several forms:
papules or nodules which are red, globular and non-blanching, with a vascular appearance
purplish nodules sufficiently similar to Kaposis sarcoma that a biopsy may be required to verify which of the two it is
a purplish lichenoid plaque
a subcutaneous nodule which may have ulceration, similar to a bacterial abscessWhile cutaneous BA is the most common form, it can also affect several other parts of the body, such as the brain, bone, bone marrow, lymph nodes, gastrointestinal tract, respiratory tract, spleen, and liver. Symptoms vary depending on which parts of the body are affected; for example, those whose livers are affected may have an enlarged liver and fever, while those with osseous BA  experience intense pain in the affected area.

Presentation
BA is characterised by the proliferation of blood vessels, resulting in them forming tumour-like masses in the skin and other organs.

Causes
It is caused by either Bartonella henselae or B. quintana.
B.  henselae is most often transmitted through a cat scratch or bite, though ticks and fleas may also act as vectors.
B. quintana is usually transmitted by lice.It can manifest in people with AIDS and rarely appears in those who are immunocompetent.

Diagnosis
Diagnosis is based on a combination of clinical features and biopsy.
Neutrophilic infiltrate.

Treatment and prevention
While curable, BA is potentially fatal if not treated