Unusual presentation of popliteal soft tissue sarcoma: not every swelling in the knee is a Baker's cyst

Popliteal soft tissue sarcoma is a rare tumour, but sometimes it does pose clinical, diagnostic and management challenges. We present here a case report which initially presented as Baker's cyst as it is one of the commonest cyst in this region. It posed a diagnostic challenge even with the help of new imaging modalities. But the patient presented herself to the hospital several times with new symptoms often pointing us towards common pathologies like Baker's cyst, deep-vein thrombosis and vascular lesions but diagnosis was established only after histology. Unfortunately, at this stage, disease was so advanced and metastasised, patient reached terminal stage and refused any kind of treatment.