“ Most common benign renal tumour , mostly incidental, unilateral and solitary. Composed of vessels, muscle and fat. In total, 2 0% are foun...
“
Most common benign renal tumour, mostly incidental, unilateral and solitary. Composed of vessels, muscle and fat. In total, 20% are found in patients with tuberous sclerosis (TS), and 80% of patients with TS have them (then they are usually multiple and bilateral). Also more common in those with neurofibromatosis and Von Hippel-Lindau disease. Prone to haemorrhage >4 cm in size—treatment is with embolisation or partial nephrectomy. Not thought to be associated with malignancy.
• Hyperechoic, solid mass—often brighter than renal sinus fat.
• May appear exophytic.
• Lesions less than 3 cm need CT or magnetic resonance imaging (MRI) to characterise fully.
CT
• Preferred for diagnosis; diagnostic if fat containing.
• May enhance avidly and be lipid poor 5%, in which case cannot be distinguished from RCC.
• The presence of central necrosis or calcification suggests RCC.
MRI
• Signal loss on out-of-phase gradient echo/fat suppression due to the presence of fat.
(a) Post-contrast axial computed tomography scan showing a large, fat-density lesion arising from the left kidney in keeping with an angiomyolipoma.
(b) Corresponding post-contrast T1 fat saturated magnetic resonance image shows some internal vascularity and peripheral enhancement of the lesion, with mainly low signal with fat saturation.
”
- For Radiology Cases, Discussion join: Radiology Made Easy on Facebook
- Subscribe to our youtube channel for FRCR radiology case discussion
- Join our Telegram group: Radiology Made Easy
