According to the provided text, what specific medical condition afflicted the nephew from Malegaon, and what treatments were attempted before his family sought Sai Baba's help?

The text from Chapter 34 specifies that the nephew suffered from a bone-cyst, referred to as Hadyavran, which is described as a most difficult and extraordinary malady. His uncle was a degree-holding doctor, yet he and his physician friends were unable to cure the ailment. The chapter details that a comprehensive range of treatments was attempted without success. These included all native and foreign treatments, and even surgery was tried. After all these efforts were exhausted and expert surgeons felt helpless, the family, seeing no improvement, decided to seek a spiritual remedy from the famous saint of Shirdi, Sai Maharaj.