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Patrick Dempsey, Caterina Scorsone along with a.T. Langer Unhealthy news: Erica, who were built with a child with Private Practice's Cooper, includes a terminal brain tumor. What's promising: Amelia Shepherd and her your government Derek will reunite to try and save her.Amelia (Caterina Scorsone) will visit Grey's Anatomy's Dallas Sophistication throughout a unique crossover episode, airing Thursday at 9/8c, by which she'll convince Derek (Patrick Dempsey) to help in preserving Erica (A.J. Langer) - something which has so far appeared impossible.Grey's Anatomy's Sandra Oh: Cristina and Owen mind to couples therapy!"We are coming in the situation from this type of host to hopelessness when it comes to Erica's prognosis, that it may only increase came from here,Inch Scorsone informs TVGuide.com. "There's pressure for Amelia to complete the very best job possible, but Erica will die, this is the hard reality that everyone's been coping with with this whole story arc, so even the truth that there is a possibility that they could live is one thing much better than what we should had thought a chapter [ago]."Erica has lengthy opposed the thought of treatment, fearing it might limit her time together with her boy Mason (Griffin Gluck). Also it is not foolproof: The difficult procedure necessitates the surgeons to get rid of the tumor in under 90 seconds. "It truly is a harmful method that they are trying to complete, so Erica's quite shaken because when immediate the choice is," Scorsone states. "She needs to decide inside a very almost no time, and when it does not go well, that's the before she sees her boy, so this is a huge decision for anybody."Exclusive: Paul Adelstein to direct a chapter of non-public Practice"Once she's there, and she's given exactly what the procedure would really entail and just how dangerous it's, also it almost sounds impossible, she's much more bookings about this,Inch adds Paul Adelstein. "The greatest challenge of to Erica is the fact that she still has not told Mason."Erica's situation will even mark the very first time the Shepherd brothers and sisters happen to be together since Amelia's recent visit to rehab. Though Derek didn't have from Amelia's large intervention the 2009 season on Private, her falling the wagon is going to be addressed throughout the crossover. "He's the one that brings up,Inch Scorsone states. "People are complicated and there's lots of history between the pair of them. They have shared good occasions and bad, but ultimately, they've a little of the confrontation about this, but it is resolved within an intriguing and positive way."Pricier Amelia, who embarked to Dallas Sophistication last season, to create a few of the same mistakes again - like sleeping with Mark Sloan (Eric Dane). "There is no time for dilly-dallying," she jokes. "Amelia has lives in order to save!InchThe Grey's Anatomy-Private Practice crossover starts at 9/8c on ABC.