Premature with chylothorax in the ICU of the Children's City Clinical Hospital, weighing up to 1 kg.
An ultrasound of the pleural cavities was prescribed for free fluid, and it really was a little on the one side, but much more fluid turned out to be in the abdominal cavity, almost everywhere, in places with "dancing" filaments of presumably fibrin, around the collapsed intestinal loops throughout the abdomen, to exclude "dancing poops" (differential diagnosis - disseminates) a surgeon was called. While he was walking, still strange mass came into the field of view: one in the projection of the stomach violating the "ultrasonic law of gravity", fortunately there was a catheter in the stomach, the attending physician injected liquid through it, after which the mass fell apart (a clot adhered to the catheter), the second mass in the sinus of one of the kidneys (probably another clot). The surgeon came and did a laparocentesis, a clear liquid (ascites) flowed through the catheter from the abdominal cavity, the abdomen significantly decreased in size.