RT Journal Article SR Electronic T1 Massive pericardial effusion in a hypothyroid child. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 231 OP 232 DO 10.1136/hrt.51.2.231 VO 51 IS 2 A1 Williams, L H A1 Jayatunga, R A1 Scott, O YR 1984 UL http://heart.bmj.com/content/51/2/231.abstract AB A child with Down's syndrome and long standing severe hypothyroidism had a massive pericardial effusion without cardiac tamponade. The effusion completely resolved with medical treatment without pericardiocentesis.