A child 16 years old with complaints of pain in the coccyx when walking, can not sit. Already had raised this complaint in past, was diagnosed with a cyst of the coccyx and by the words of the patient, the contents of the cyst was evacuated thru syringe. Currently there is an area of skin redness in the coccyx area. On US in this projection is visualized irregular oval shaped heteroechoic lesion, type of complex cyst with a thick wall and heterogeneous content (hair?), size of 2x4cm, with increased blood flow at CFM, as well as in the surrounding tissues (inflammed pilonidal cyst?). external link | 
