Abstract
Late relapsing parosteal osteosarcoma has been reported very rarely; however, to the best of our knowledge, long-term repeated recurrence of this tumor has not been reported yet. Herein, we present a case of late relapsing low grade parosteal osteosarcoma after 15 years in popliteal cavity after advising tumor excision, removal of the organ involved, and the placement of prosthesis.
Highlights
Parosteal osteosarcoma is a rare low-grade highly differentiated tumor which usually arises from periosseous tissues adjacent to the bone cortex that commonly appeared in the distal dorsal femur
Because of low-grade nature of parosteal osteosarcoma, better prognosis of this tumor compared with other types of osteosarcomas is predictable
In high-grade areas, the prognosis may approach that of conventional high-grade osteosarcomas, and the patient requires radiochemotherapy in addition to surgical excision
Summary
Parosteal osteosarcoma is a rare low-grade highly differentiated tumor which usually arises from periosseous tissues adjacent to the bone cortex that commonly appeared in the distal dorsal femur. Despite high successfulness of surgical approach, it is contraindicated for those who suffered generalized metastasis and may result in some significant complications such as impaired wound healing, local or systemic infections, hematoma, neurovascular injury, failure of prosthesis implantation, and recurrence This type of osteosarcoma has been reported to have a better prognosis than other variants, but it has a potential to turn into a high-grade poorly differentiated tumors as well as to rarely recur. It has a slow rate of development, it may eventually destroy the cortex and involves the medulla at later stages [3]. We present a case of repeated recurrent parosteal osteosarcoma in the distal femur years after its initial excision and radiotherapy
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