a. What is the most likely diagnosis?

   b. What serological test would you consider?

   c. What is the main cause of decreased vision
       in this patient?

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This man has this slowly progressive lesion of his nose. 

a. What is the most likely diagnosis?

Kaposi's sarcoma.
It is a vascular tumour and typically presents as violaceous nodule as shown.

b. What serological test would you consider?

HIV tests.

c. What is the main cause of decreased vision in this patient?

Cytomegaloviruts retinitis.

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