 Boas lose weight and may develop clogged nares (nostrils), stomatitis, or secondary pneumonia.The disease can rapidly progress to produce nervous-system disorders, such as disorientation, corkscrewing of the head and neck, holding the head in abnormal and unnatural positions, rolling onto the back, or stargazing.Stomatitis, pneumonia, undifferentiated cutaneous sarcomas, lymphoproliferative disorders, and leukemia have all been observed in affected specimens.