What specific ailment was the nephew from Malegaon suffering from, and what kinds of treatments were attempted before his family turned to Sai Baba's Udi?

According to the details provided in Chapter 34, the doctor's nephew from Malegaon was afflicted with a "bone-cyst," which is also referred to by its common name, "Hadyavarn." This condition was described as a most difficult and extraordinary malady. Before seeking Sai Baba's help, his family had exhausted all possible medical options. The text explicitly states that all native and foreign treatments were tried. Furthermore, the boy's uncle was a physician himself, and his expert physician and surgeon friends also attempted various treatments and even surgery, but all efforts were exhausted without success, leaving them feeling helpless.