What specific medical condition did the boy from Malegaon have, and why were conventional treatments ineffective?

The boy from Malegaon suffered from a condition identified in Chapter 34 as a bone-cyst, or Hadyavarn. The text describes it as a 'most difficult and extraordinary malady.' Conventional treatments were entirely ineffective because of the severity and unusual nature of the disease. His uncle, a doctor, along with other 'expert and intelligent surgeons,' attempted numerous remedies. The Satcharitra states that 'all native and foreign treatments were tried' and 'all efforts were exhausted.' Even a surgical intervention was attempted, but it failed to provide any relief, leaving the medical professionals feeling helpless and demonstrating the limits of their science against this particular affliction.