SUMMARYA case of haemosiderosis pulmonum is recorded in a girl who was 6 ½ years old when the disease began and 10 ½ years old when she died. The diagnosis, made during life, depended on the signs: An intermittent course of the disease, sideropenic and haemolytic anaemia, numerous haemoptyses, miliary infiltrations of the lungs and «heart failure cells» in a section of the blood‐stained sputum. There was no sign of heart disease. No post‐mortem exam