Paralabral cysts are swellings that arise around the socket of the shoulder joint (glenoid). They are pockets of joint fluid that develop outside of the joint under tears of the labrum. These are also known as ganglia (or a ganglion).
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A paralabral cyst is termed when a focal well-defined collection of fluid is seen within 1 cm of the glenoid labrum -
http://radiopaedia.org/articles/paralabral-cyst-of-the-shoul...--------
Paralabral cysts of hip joint are a location specific subtype of paralabral cysts. They are predominantly small, sometimes septate, well-defined multiloculated fluid intensity lesions seen closely associated with acetabular labral tears. -
http://radiopaedia.org/articles/paralabral-cyst-of-the-hip-1