[Duplex sonography: a highly echogenic splenic cyst or splenomegaly?].

A 27-year old woman presented sonographically with a highly echogenic mass in the left upper quadrant of the abdomen measuring 22 cm in diameter, initially interpreted as splenomegaly. Movement of internal echoes by application of pulsed doppler and by postural change of the patient revealed this mass as a cystic lesion with highly echogenic fluid. At surgery, a pseudocyst of the spleen containing detritus and cholesterol crystals was found.