Can you describe the medical condition and the failed treatments for the boy from Malegaon mentioned in the Satcharitra?

According to Chapter 34, the nephew of a doctor from Malegaon suffered from a "bone-cyst," referred to as Hadyavarn. The text describes this as a "most difficult and extraordinary malady." His uncle, a degree-holding doctor, along with his physician friends and even "expert and intelligent surgeons," tried numerous remedies. The chapter explicitly states that all native and foreign treatments were attempted and that even surgery was performed, but nothing succeeded. The medical professionals became exhausted and felt helpless, as the disease showed no improvement, highlighting its incurable nature by conventional medicine at the time.