Can you describe the ailment that afflicted the doctor's nephew in Malegaon, as mentioned in Chapter 34?

According to Chapter 34 of the Shri Sai Satcharitra, the doctor's nephew from Malegaon suffered from a terrible and difficult disease. The text identifies this ailment as a bone-cyst, which is also referred to by the name Hadyavarn. This malady was described as extraordinary and showed no improvement with any form of medicine. The chapter emphasizes the severity of the condition by stating that the doctor himself, along with his expert physician and surgeon friends, tried various native and foreign treatments and even surgery, but all efforts were exhausted and proved unsuccessful, leaving them feeling helpless. The young nephew was in great distress and suffering from the immense pain caused by this incurable disease.