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Background: Congenital cartilage masses can cause pain and restrict joint movement. This mass can be used in the differential diagnosis of osteomyelitis and other benign cartilage masses, such as osteochondroma and chondroma. Case description: In this report, a 51-day-old boy with a pathological diagnosis of cartilage mass in the proximal tibia is introduced. The patient had normal growth and development and was referred due to presence a mass below his right knee. Based on the pathological findings, the final diagnosis was congenital cartilage mass. Conclusion: The presence of a cartilage mass can mimic the symptoms of osteomyelitis, and since treatment for osteomyelitis must be performed promptly, it is important to distinguish between congenital cartilage masses and osteomyelitis. In addition, the presence of the cartilage mass in the patient affected joints movement and caused pain, indicating the importance of the need for intervention.