A 10 year old child develops hematuria after 2 days of diarrhoea. lood film shows fragmented RBCs & thrombocytopenia. Ultasound shows marked enlargement of both kidneys. The Ilkley diagnosis is –
**Core Concept**
The child's symptoms suggest a diagnosis related to the activation of the coagulation pathway in response to a gastrointestinal infection, leading to microangiopathic hemolytic anemia (MAHA) and thrombocytopenia. This condition is characterized by the fragmentation of red blood cells and the formation of microthrombi in small blood vessels.
**Why the Correct Answer is Right**
The presence of fragmented red blood cells (schistocytes) and thrombocytopenia on the blood film, along with marked kidney enlargement on ultrasound, are indicative of HUS (Hemolytic-Uremic Syndrome). HUS is a complication of Shiga toxin-producing E. coli (STEC) infections, which can occur after a diarrheal illness. The Shiga toxin produced by STEC causes endothelial damage, leading to the activation of the coagulation pathway and the formation of microthrombi in small blood vessels, including those in the kidneys.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the clinical presentation described. The child's symptoms do not suggest a diagnosis related to a urinary tract infection or an obstructive uropathy.
* **Option B:** This option is not supported by the clinical findings. The presence of fragmented red blood cells and thrombocytopenia, rather than hemolytic anemia, makes this diagnosis unlikely.
* **Option C:** This option is not consistent with the ultrasound findings. The marked kidney enlargement on ultrasound is not typical of a simple pyelonephritis.
**Clinical Pearl / High-Yield Fact**
It is essential to consider the diagnosis of HUS in any child who presents with hematuria and thrombocytopenia after a diarrheal illness, as timely recognition and management can significantly improve outcomes.
**Correct Answer:** HUS (Hemolytic-Uremic Syndrome)