Sweet hydrothorax: a common presentation of a rare condition.

Sweet hydrothorax is a known, yet rare, complication of peritoneal dialysis. It can be life-threatening. This case is about a 70-year-old lady who presented with acute respiratory failure due to massive right-sided hydrothorax that developed insidiously over 3 months of starting peritoneal dialysis. Thoracentesis and technetium scan confirmed the diagnosis. Treatment was successful with hemodialysis.