Thank you for taking my question. I am a 50 yr old female, about 30 lbs overweight with high cholesterol, but otherwise in good health (I am now exercising 1 hr/day, and successfully reducing cholesterol with herbal medication). Subsequent to a MVC in 1973, I developed left leg numbness and muscle atrophy. A laminectomy was performed in 1978 at L2/3 and L3/4 to provide space to the existing lipoma, which was just over 2 cm with an extension to L5/S1. A recent MRI report described a collection of fat extending from L2/3 to L5 over a length of 6.6 cm, with a maximum AP diameter of 19 mm and maximal transverse diameter of 15 mm. It causes some flattening of the posterior aspect of the cord, most marked behind L3. The conus tip extends to L4. There is also a large arachnoid cyst in the left posterolateral aspect of the spinal canal, extending from L4/5 to S1/2 and is 4.7 cm long. Its maximal AP and transverse dimensions are 2.7 and 1.5 cm. It caused considerable flattening of the left posterolateral aspect of the thecal sac and some mass effect on the left L5 nerve root. Spinal canal and foraminal dimensions are well maintained. Would you please briefly discuss risks and benefits of micro-surgery to remove the lipoma and cyst? Any idea of why the lipoma and cyst grew or how I can prevent further growth? What is the likelihood of retethering? Is there anything else I ought to consider? Thank you very much for your time and trouble. JS
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