What was the disease 'Hadyavarn' mentioned in the Satcharitra, and why was it considered so difficult to treat?

The disease 'Hadyavarn,' as detailed in Chapter 34, is identified as a bone-cyst. The text describes it as a 'most difficult and extraordinary malady.' Its severity is emphasized by the fact that the patient's uncle was a degree-holding doctor himself. He, along with his physician friends and even 'expert and intelligent surgeons,' felt helpless and exhausted after trying numerous treatments. According to Chapter 34, all native and foreign medical approaches, including surgery, were attempted without any success. The complete failure of the medical community to provide even the slightest relief established the disease as incurable by conventional means, setting the stage for the family's eventual turn to Sai Baba for a spiritual solution.