It is caused by Klebsiella<unk> tis—subspecies of Klebsiella pneumoniae— a gram-negative, encapsulated, nonmotile, rod-shaped bacillus (diplobacillus), member of the family Enterobacteriaceae. It is sometimes referred to as the "Frisch bacillus," named for Anton von Frisch who identified the organism in 1882. It is contracted directly by droplets or by contamination of material that is subsequently inhaled.
Rhinoscleroma
Chorangioma
Chorioangioma
Sinusoidal hemangioma
Spiradenoma
Apudoma
Aquarium granuloma
Spider angioma