Jacques Barzun, the noted Columbia University historian of ideas and culture, once described the feeling that some people experience when they come upon a new reference book. He wrote: Hand over to one of us a new Dictionary, Companion, or Guide, and our eyes first light up and then turn dreamy: we have seized the volume and are off, arm in arm with the guide i or companion. The book now in your hands made my eyes light up. Thyroid Disorders with Cutaneous Manifestations is that kind of book. Heymann, who has been fascinated by this sometimes controversial subject for decades, has brought not...