Lateral Meniscal cysts are 10 times more common than the medial meniscus cysts. Trauma is the main cause for these meniscal cysts. 32 years old female came with complaints of pain and swelling the inner aspect of left knee and had a previous history of trauma 3 years back. On examination a swelling of size 3x1 cm was seen on the medial aspect of the right knee. MRI diagnosed a tear in the posterior horn of the medial meniscus with a parameniscal cyst adjacent to the medial meniscus. Arthroscopically through posterior trans septal approach, the medial parameniscal cyst was surgically resected and the meniscal tear repaired. If a meniscal cyst is arising from the posterior horn of the medial meniscus, arthroscopic posterior trans-septal decompression and resection and repair of the meniscus is a suitable surgery.
