The outside walls of a room can be diagrammed and tell us something of the room inside. It’s not perfect, but it does give us some information. Likewise, Goldstein drew sharp lines between the diseases FCH and FH, while at the same time warning the reader that they can be confused with each other. In a sense, we can focus on FCH as if it were a wall that can tell us something about the FH on the other side. So, here, let’s look at a modern definition of FCH – by the very EAS group guilty of citation kiting in the industry’s Authoritative reports. (More on this later).