Office of Rare Diseases listed<unk>  as a "rare disease". This means that<unk> , or a subtype of<unk> , affects less than 200,000 people in the US population. Orphanet, a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list<unk>  as a "rare disease".
Lyngstadaas syndrome
Galloway Mowat syndrome
Grinspan's syndrome
DeSanctis–Cacchione syndrome
Hapnes Boman Skeie syndrome
Sack–Barabas syndrome
Wallis–Zieff–Goldblatt syndrome
Zieve's syndrome