Chronic cases of which condition may show signs of lumps on a rabbit's body?

The condition associated with chronic cases that may show signs of lumps on a rabbit's body is myxomatosis. This viral disease is caused by the Myxoma virus and is known for causing significant swelling, particularly around the eyes, ears, and external genitalia, leading to the formation of lumps or tumors. These lumps result from the body's immune response to the infection and are a hallmark of chronic myxomatosis, reflecting its highly contagious and severe nature.

In contrast, viral hemorrhagic disease (VHD) primarily causes acute symptoms and is characterized by rapid deterioration and sudden death, rather than the development of lumps. Coccidiosis is a parasitic disease that affects the intestinal tract and does not typically manifest in external lumps but rather through digestive symptoms such as diarrhea. Parasites, while they can lead to various health issues in rabbits, do not specifically cause lump formation as seen in myxomatosis.

Overall, myxomatosis is distinct in its appearance and chronic progression, making it the correct choice in identifying the condition that may lead to lumps on a rabbit's body.