The pseudocapsule of pleomorphic adenomas (benign mixed tumors): the argument against enucleation.
The "well encapsulated" pleomorphic adenoma has at best a pseudocapsule which allows for bits of satellite tumor to be left behind at ""enucleation" surgery as well as for easy "spillage" of tumor by the overconfident surgeon. Recurrent pleomorphic adenomas then become difficult tumors to eradicate and place vital structures, such as the facial nerve, in jeopardy.
D008949:Adenoma, Pleomorphic / Q000473:pathology / Q000601:surgery*; D020220:Facial Nerve Injuries; D006801:Humans; D009364:Neoplasm Recurrence, Local; D010306:Parotid Gland / Q000473:pathology / Q000601:surgery*; D010307:Parotid Neoplasms / Q000473:pathology / Q000601:surgery*