FSIP1 and hyperinsulinemic hypoglycemia, familial, 4: Compared with previously reported HSD10 deficiency patients, whose HSD17B10 gene bears a c.388C>T variant [8]–[10], the current patient has much milder neurological symptoms that are somewhat similar to patients with MRXS10 caused by a silent mutation in the HSD17B10 gene [17], [18].