A Classical Case of Sessile Osteochondroma in a 13-Year-Old Boy.

This case report highlights the understanding of the swelling feature of the right knee in a young adult and gives an overview of bone tumors. We are presenting a case of right knee swelling in a 13-year-old boy who was anxious before the investigations. Additionally, this report provides an approach for an accurate diagnosis of swelling. It highlights the approach to bone swelling and provides an overview of how to classify bone tumors. With the help of advanced technology such as magnetic resonance imaging (MRI), it gives detailed information about the nature of bone tumors, especially in the case of sessile osteochondroma. This case report also gives us information about the classification of bone tumors and their progression and guides us toward management with the help of an MRI.