Differential Diagnosis for Intrameniscal Cyst within the Lateral Meniscus
Single Most Likely Diagnosis
- Meniscal tear: The presence of an intrameniscal cyst is highly suggestive of a meniscal tear, as these cysts often form as a result of the degeneration and tearing of the meniscus, allowing synovial fluid to accumulate within the meniscal tissue.
Other Likely Diagnoses
- Meniscal degeneration: This condition involves the wear and tear of the meniscus over time, which can lead to the formation of intrameniscal cysts without a distinct tear.
- Meniscus synovial cyst: Although often associated with meniscal tears, these cysts can also occur due to the herniation of synovial tissue through a weakened area in the meniscus.
Do Not Miss Diagnoses
- Septic arthritis: Although less likely, an intrameniscal cyst could potentially become infected, leading to septic arthritis, a condition that requires urgent medical attention to prevent serious complications.
- Osteochondritis dissecans: This condition involves a piece of cartilage and bone becoming detached from the surrounding bone, which could potentially mimic the symptoms of an intrameniscal cyst if located near the meniscus.
Rare Diagnoses
- Ganglion cyst: While more commonly associated with the wrist, ganglion cysts can occur near joints, including the knee, and could potentially be mistaken for an intrameniscal cyst.
- Synovial chondromatosis: A rare condition characterized by the growth of cartilage in the synovial membrane, which could potentially lead to the formation of cystic structures within the knee joint.