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Periosteal Ganglion Rare lesion: majority in the region of the pes anserinus >> ends of long tubular bones. More common in men, 4th-5th decades.
Thought to derive from mucinous degeneration of the periosteum; other theory: migrating fluid from a distended joint into the periarticular soft tissue. Multilobulated cystlike lesions. Well-defined, corrugated appearance. May show cortical scalloping caused by extrinsic pressure remodeling.