Function-preserving R1 resection plus postoperative 60 Gy radiotherapy achieved local control with no recurrence or metastasis at 18 months in a patient with popliteal myxoid liposarcoma.
Case Report (n=1)
Does function-preserving R1 resection plus postoperative radiotherapy prevent local recurrence and maintain limb function in a young patient with popliteal myxoid liposarcoma?
Function-preserving R1 resection combined with postoperative radiotherapy can achieve local control and maintain limb function in young patients with popliteal myxoid liposarcoma abutting neurovascular structures.
Rationale: Myxoid liposarcoma (MLS) accounts for 30% of liposarcomas and typically arises in the thigh, but rarely arises in the popliteal fossa. Managing giant, neurovascular-abutting MLS in young adults is poorly characterized. Patient concerns: A 35-year-old man presented with a right popliteal mass growing over > 6 years, accompanied by progressive swelling and incomplete flexion of the right knee. He denied smoking, denied alcohol use, and had no family history of malignancy. Diagnoses: magnetic resonance imaging showed a 179 × 154 × 99 mm multilocular cystic–solid lesion abutting/partly encasing the popliteal vessels and contacting the sciatic/common peroneal nerves. Preoperative cytology suggested benignity; definitive resection revealed MLS grade II with 20% round cell component (R1 margin adjacent to the vessel plane). Interventions: En bloc resection with function-preserving R1 margins was performed given neurovascular involvement; popliteal artery/vein and nerves were preserved. Postoperative external-beam radiotherapy was delivered to 60 Gy in 30 fractions (2 Gy/fraction). Outcomes: At the 18-month follow-up, progressive recovery of knee joint range of motion was observed, and no local recurrence or metastasis at 18 months. Magnetic resonance imaging at 6 and 18 months showed no local-recurrence or metastasis. Lessons: This case demonstrates that in young patients with popliteal MLS closely related to neurovascular structures, function-preserving R1 resection plus postoperative 60 Gy can achieve local-control while maintaining limb function, provided meticulous technique and guideline-concordant surveillance.
Xu et al. (Fri,) conducted a case report in Myxoid liposarcoma of the right popliteal fossa (n=1). En bloc resection with function-preserving R1 margins and postoperative external-beam radiotherapy was evaluated on Local recurrence or metastasis. Function-preserving R1 resection plus postoperative 60 Gy radiotherapy achieved local control with no recurrence or metastasis at 18 months in a patient with popliteal myxoid liposarcoma.