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Once Through

Q.  This budgerigar is presented with severe beak deformity due to white, porous, proliferative encrustations. Similar lesions are noted around the vent. What is the most likely diagnosis?
  1. Cnemidocoptes pilae
  2. Dermanyssus gallinae
  3. Squamous cell carcinoma
  4. Fibrosarcoma
  5. Xanthoma