A10-year-old boy rapidly develops hypoglycemia after moderate activity. Blood examination reveals raised ketone bodies, lactic acid, and triglycerides. On examination, the liver & kidneys were enlarged. Histopathology of the liver shows deposits of glycogen in excess amount. What is the diagnosis?
## **Core Concept**
The question describes a clinical scenario suggestive of a glycogen storage disease (GSD), which is a group of inherited disorders characterized by the abnormal storage of glycogen in various tissues, leading to metabolic dysfunctions. The symptoms and laboratory findings point towards a specific type of GSD that affects the liver and leads to hypoglycemia, lactic acidosis, and hepatomegaly.
## **Why the Correct Answer is Right**
The clinical presentation of hypoglycemia, elevated ketone bodies, lactic acid, and triglycerides, along with hepatomegaly and renal enlargement, is highly suggestive of **Glycogen Storage Disease Type I (GSD I)**, also known as von Gierke's disease. This condition results from a deficiency of glucose-6-phosphatase, an enzyme crucial for gluconeogenesis and glycogenolysis in the liver, kidneys, and intestines. The deficiency leads to an inability to convert glycogen to glucose for energy, causing glycogen accumulation in the liver and kidneys, and resulting in severe hypoglycemia, lactic acidosis, and hyperlipidemia.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a known glycogen storage disease directly related to the symptoms described.
- **Option B:** This option is incorrect as it does not directly correlate with the clinical and biochemical findings presented in the scenario.
- **Option C:** This option might seem plausible as it involves a glycogen storage disease, but it does not accurately reflect the specific clinical and biochemical profile described, which is most consistent with GSD I.
- **Option D:** This option is incorrect because while it might relate to glycogen storage diseases, it does not accurately represent the condition described.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl in this scenario is that patients with **GSD I** often present with "doll's face" appearance due to hepatomegaly, and they are at risk of developing complications such as gout, pancreatitis, and hepatic adenomas. A classic exam-relevant point is that these patients have a high risk of lactic acidosis and hypoglycemic episodes, which can be life-threatening.
## **Correct Answer:** D. **Von Gierke's disease (Glycogen Storage Disease Type I)**