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Orthopedics & Traumatology

Parosteal Osteosarcoma, Posterior Distal Femur

ICD-10 Code
C40.21_5

Low-grade surface osteosarcoma classicaly arising from the posterior cortex of the distal femur.

Clinical Presentation & Protocol

Patient Usually Complains Of

Patient presents with a chronic, slowly progressive posterior distal thigh mass. Reports dull, aching pain localized to the popliteal fossa, exacerbated by knee flexion. No history of constitutional symptoms, night sweats, or rapid weight loss. Denies recent trauma or mechanical locking/giving way.

Clinical Examination Findings

Physical exam reveals a firm, fixed, non-tender, lobulated mass arising from the posterior distal femur. Overlying skin is intact without erythema or venous engorgement. Knee range of motion is restricted in terminal flexion due to mass effect. Neurovascular status is intact distally; popliteal pulse is palpable.

Treatment Protocol

Recommended management includes wide surgical resection of the tumor with clear margins. Pre-operative MRI/CT imaging required for surgical planning to assess neurovascular bundle involvement. Post-operative surveillance protocol initiated with serial radiographs and cross-sectional imaging to monitor for local recurrence.

Detailed clinical guide coming soon.