pseudocapsule
False capsule of compressed tissue surrounding malignant bone tumors, often containing microscopic tumor cells.
Full Definition
A pseudocapsule is a rim of compressed normal tissue, reactive bone, and fibrous tissue that forms around malignant bone tumors, creating the appearance of encapsulation. Unlike a true capsule, the pseudocapsule frequently contains microscopic tumor cells and should never be considered a safe surgical margin. This structure is particularly important in surgical planning, as inadvertent violation of the pseudocapsule during surgery can lead to tumor spillage and local recurrence. Recognition of the pseudocapsule's unreliability is fundamental to achieving adequate oncological margins.
Usage
Usage note: Emphasize that pseudocapsule violation compromises oncological safety.
In Context
- "The surgeon carefully avoided violation of the tumor pseudocapsule during the wide excision." — Operative report
- "Histological examination confirmed tumor cells within the pseudocapsule, validating the decision for wide margins." — Pathology report