Teenager with complaints about recently former shin swelling for an unknown reason, aims to ultrasound of lower extremity veins with suspected lower extremity deep vein thrombosis. At ultrasound the deep veins are normal, at the medial surface of the popliteal fossa visualized tubular mass looks like a cyst, at CFM without blood flow but during shin compression with flow at CFM(phlebectasia?), at the medial surface of almost full length of the shin large mass with multiple partitions looks like encapsuled fluid (hematoma? teenager denies trauma) without blood flow at CFM. No clear border between this two(?) masses were found. Later examined by another sonologist(looked together), at standing position the popliteal fossa mass was colored by CFM, however the doctor made conclusion that this is a Baker' s cyst. external link | 
