title: A painful, swollen lower extremity.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007719:Knee Joint; D010146:Pain / Q000175:diagnosis; D011151:Popliteal Cyst / Q000175:diagnosis*; D011152:Popliteal Vein; D013581:Synovial Cyst / Q000175:diagnosis*; D013927:Thrombosis / Q000175:diagnosis*