Wednesday morning - providentially, the day I'd scheduled my first phone session with Dr. Luz, my therapist - our pediatrician called to tell me what she had discovered while looking into Caroline's tip-toe walking and any link to Arthrogryposis.
She asked us to see a pediatric geneticist because she's concerned that we may be dealing with a form of X-linked Arthrogryposis. With X-linked diseases, male children (who have only one X chromosome, their mothers) will display the full effect of the disorder - which, in our case, is lethal - while female children (who have two X chromosomes, one from mom and one from dad) will be only carriers or display a very mild form of the disease. Clearly, lots of bells went off for me, since we've lost three* boys and have two healthy girls. If this were the case, we would want to have me and both girls tested. In my case, it would potentially explain our history with one unified theory, rather than three disparate shitty-luck scenarios. It would also tell us whether or not trying for another child would be sheer folly - a 50/50 shot at best. For the girls, it would arm them with information about their own parenting options once grown, as well potentially explaining the origin of Caroline's leg and foot issues.
But here's the kicker (oh, hell, who am I kidding? there are approximately 18,091 kickers in this scenario): to my genetic counselor's knowledge (we're still friends from when she was involved in Thomas's diagnosis), there is no test for these forms of Arthrogryposis. The pediatric geneticist, however, would be better equipped to tell us if that's the case.
Secondly, our pediatrician agreed that a visit to a pediatric orthopedist would be a good idea. This will give us a clear answer as to whether or not Caroline has some cause of her tip-toe walking, rather than just being idiopathic (as is the case with the vast majority of tip-toe walkers). He could also tell us if her symptoms fall on the supremely mild end of the Arthrogryposis scale, or not.
I feel confident that none of this really impacts Caroline's prognosis or treatment - regardless of the cause, the treatment all follows roughly the same course. I'm really not all that worried about her, overall. At least I don't think I am.
But let me assure you, the idea of carrying a disorder that is fatal to all my boy babies - and of possibly passing along this disorder to my girls, who consequently could have no boy babies of their own... well, that's thrown me. And thrown me far, at that.
I'm doing my best not to "write the end to the story", as per Dr. Luz's request. But Wednesday proved to be a rough day, nonetheless. And I'm sure the rest of this year will provide more "opportunities" to revisit the past than I ever anticipated.
I'm sure all talk more about my feelings and the multitude of possibilities that have tumbled my way as a result of all this... but not right now. That's how you eat an elephant: one bite at a time; and you don't start with the ass.
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Update: Apparently, my understanding of X-linked disorders is off. Here's a better explanation. Still highly worrisome, but with a potential for unaffected babies.