Original procedure link above. Large cyst on knee 3 month follow up. This was a large cyst in a small space, so you can see how it flattened out like a pancake under pressure. You can also see the very large skin flakes removed from the sac. They were so packed tight they almost resembled brain tissue. This was a good one. Thanks again to my patient for sharing his procedure and coming back for follow ups! Dermatology procedure. Dermatology Physician Assistant. Knee cyst. Excision and closure. MrPopZit.