Acute intermittent porphyria
Are there different types of acute intermittent porphyria?
Acute intermittent porphyria (AIP) can be divided into two types. Clinically manifesting or overt AIP happens in people who are currently showing symptoms of AIP or who just had an acute attack. Latent or presymptomatic AIP happens in people who have never had symptoms of AIP. Some people with the latent form may never have acute attacks.
Acute Intermittent Porphyria. Gene Reviews. (http://www.ncbi.nlm.nih.gov/books/NBK1193/)
PORPHYRIA, ACUTE INTERMITTENT; AIP. OMIM(http://www.omim.org/entry/176000)