"Precisely, SummerPhD. We will include ""both"", actually ""all"" as you'll find the statistics on this, the progression of Diagnosed Stage One TTTS cases, are quite wide-ranging.  The contentious point I am referring to is the assertion that ""The natural history of stage I TTTS is that more than three-fourths of cases remain stable or regress without invasive intervention, with perinatal survival of about 86%. Therefore, many patients with stage I TTTS may be managed expectantly."" This is a highly questionable point, competing figures exist. Also these ""non-progressing Stage Ones"" still have a 14% rate of mortality, so I guess something other than TTTS killed One in Six of them? (Dr. Simpson IS referring to that ""About Three Quarters"" when she assigns a ""Perinatal Survival of about 86%"" to them, correct?) Again I thank you for your time on this, it is appreciated that there is a person of your academic caliber working on this page.    

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