Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Osteomesopyknosis ?
    ### Response:
    What are the signs and symptoms of Osteomesopyknosis? Osteomesopyknosis may cause chronic, low-grade back pain in the thoracic (middle) and lumbar (lower) regions. It is considered a mild form of osteosclerosis and is usually found in young adults or teenagers.
    