Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bannayan-Riley-Ruvalcaba syndrome ?
    ### Response:
    Bannayan-Riley-Ruvalcaba syndrome is a genetic condition characterized by a large head size (macrocephaly), multiple noncancerous tumors and tumor-like growths called hamartomas, and dark freckles on the penis in males. The signs and symptoms of Bannayan-Riley-Ruvalcaba syndrome are present from birth or become apparent in early childhood.
    