¹⁸F-FDG PET/CT findings of mesenchymal hamartoma of the liver in an adolescent

Excerpt

A 16-year-old girl, with a history of post-exercise right knee pain and poor treatment response, was inadvertently found an abdominal mass by ¹⁸F-fluorodeoxyglucose positron emission tomography/computed tomography (¹⁸F-FDG PET/CT) to eliminate the likelihood of malignancy and rare syndromes. She exhibited no obvious nausea, vomiting, and jaundice, but just poor weight gain. A physical examination revealed a palpable right upper quadrant mass. Besides a mildly elevated serum alkaline phosphate level, the laboratory tests were normal. On magnetic resonance imaging (MRI) scan, the huge lesion showed hypointense areas on the axial T1-weighted images, slightly hyperintensity on the axial T2-weighted images and slightly hyperintensity on the diffusion weighted imaging. Upon enhanced MRI scan, the lesions displayed significant persistent enhancement with unenhanced foci at the epicenter. According to ¹⁸F-FDG PET/CT, the slightly low-density hepatic solid tumor was mildly hypermetabolic. There was no other pathological uptake in the whole body. The mass was excised by partial hepatic lobectomy. The pathological diagnosis was mesenchymal hamartoma of the liver (MHL). Furthermore, the right knee was clinically diagnosed as sports injury.

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