An integrated circuit structure may be fabricated having a first integrated circuit package comprising a first integrated circuit device electrically attached to a first surface of a first substrate, a second integrated circuit package comprising a second integrated circuit device electrically attached to a first surface of a second substrate and an opening extending between a first surface of the second substrate and the second surface of the second substrate, and an interconnection structure electrically attached to the first surface of the first substrate, wherein a portion of the interconnection structure extends into the second substrate opening and wherein the interconnection structure is electrically attached to a first surface of the second substrate.