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Hereditary tyrosinaemia (HT) type 1A
A H Lam1, A C Villanueva, J Ong
1Department of Radiology, Royal Alexandra Hospital for Children, Camperdown NSW, Australia.
Insights
Hepatocerebral dystroglycanopathy (HT) Type 1 A in infants presents with characteristic sonographic findings of enlarged liver and kidneys. CT scans offer limited additional diagnostic value beyond sonography for this condition.
Area of Science:
- Pediatric Radiology
- Medical Imaging
- Hepatology
Background:
- Hepatocerebral dystroglycanopathy (HT) Type 1 A is a rare genetic disorder affecting infants.
- Accurate and timely diagnosis is crucial for managing affected children.
- Imaging plays a key role in the diagnostic workup of suspected cases.
Observation:
- This study investigated the sonographic and CT imaging features in two infants diagnosed with chronic HT Type 1 A.
- The imaging findings were correlated with the known pathological processes of the disease.
- Specific attention was paid to the liver and kidney manifestations.
Findings:
- Sonography revealed marked hepatomegaly with increased parenchymal echogenicity due to fibrosis and fatty infiltration.
- Hypoechoic regenerating nodules of varying sizes were observed within the liver parenchyma.
- Marked nephromegaly with uniform thickening of the renal cortices was also noted.
- CT imaging provided minimal additional diagnostic information compared to sonography, apart from density measurements and perfusion status.
Implications:
- The typical sonographic features described in this study can aid in the early identification of HT Type 1 A.
- Sonography should be considered the primary imaging modality for evaluating infants with suspected HT Type 1 A.
- These findings suggest that CT may not be necessary in all cases, potentially reducing radiation exposure and healthcare costs.
Abstract:
Two infants, aged 5 and 6 months, with the chronic form of HT Type 1 A were studied with sonography and CT. The imaging findings mirrored the pathological process. The sonographic findings included marked hepatomegaly, the parenchyma being of increased echogenicity due to fibrosis and fatty infiltration, and containing multiple hypoechoic regenerating nodules of varying sizes. There was marked nephromegaly, with uniform thickening of the renal cortices. Apart from the density measurement of the hepatic nodules and the perfusion status of the liver and kidney, no additional information was added by CT imaging. The diagnosis of HT Type 1 A should be excluded in an infant presented with the described typical sonographic features.