Prototheca
Protothecia species are rare causes of nodular dermatitis. The face and nasal planum are commonly affected.
Huth N, Wenkel RF, Roschanski N, Rösler U, Plagge L, Schöniger S. Prototheca zopfii Genotype 2-induced Nasal Dermatitis in a Cat. J Comp Pathol. 2015;152(4):287-290.
Kano R, Sobukawa H, Suzuki M, et al. Immunohistopathology of Prototheca wickerhamii in cutaneous lesions of protothecosis. Med Mycol J. 2014;55(1):E29-E32.
Endo S, Sekiguchi M, Kishimoto Y, et al. The first case of feline Prototheca wickerhamii infection in Japan. J Vet Med Sci. 2010;72(10):1351-1353.
Kessell AE, McNair D, Munday JS, Savory R, Halliday C, Malik R. Successful treatment of multifocal pedal Prototheca wickerhamii infection in a feline immunodeficiency virus-positive cat with multiple Bowenoid in situ carcinomas containing papillomaviral DNA sequences. JFMS Open Rep. 2017;3(1):2055116916688590. Published 2017 Jan 1. doi:10.1177/2055116916688590
Coloe PJ, Allison JF. Protothecosis in a cat. J Am Vet Med Assoc. 1982;180(1):78-79.
Finnie JW, Coloe PJ. Cutaneous protothecosis in a cat. Aust Vet J. 1981;57(6):307-308.
Feline Sterile Pyogranuloma Syndrome
Giuliano A, Watson P, Owen L, Skelly B, Davison L, Dobson J, Costantino-Casas F. Idiopathic sterile pyogranuloma in three domestic cats. J Small Anim Pract. 2020 Mar;61(3):202-205