Oculomotor nerve palsy, an unusual onset of polyarteritis nodosa

Introduction Cranial nerve involvement in polyarteritis nodosa(PAN) is underrecognized and rarely reported. The aim of this article is to review the available literature and present an example of oculomotor nerve palsy in the course of PAN. Material and Methods Evaluation of texts describing the analyzed problem using the terms “polyarteritis nodosa”, “nerve”, “oculomotor”, “cranial nerve” and “cranial neuropathy” for searching the PubMed database was done. Only full-text articles in English language with titles and abstracts were included in the analysis. As a guideline for the analysis of articles, the methodology described in the Principles of Individual Patient Data systematic reviews (PRISMA-IPD) was used. Results After screening articles only 16 reported cases of PAN with cranial neuropathy were included in the analysis. In 10 the cranial neuropathy was reported as the initial manifestation of PAN with optic nerve involvement as the most frequent (62.5%); among these cases the oculomotor nerve was in-volved in 3 cases. Treatment with glucocorticosteroids and cyclophosphamide was the most com-mon. Conclusions Although cranial neuropathy, especially oculomotor nerve palsy is a rare first neurological manifesta-tion of PAN, this clinical problem should be considered in the differential diagnosis. Especially patients with peripheral neuropathy, general symptoms, skin lesions and hepatitis B virus infection should be evaluated for cranial nerve involvement in the course of vasculitis. In the case of unclear involvement of the cranial nerves, PAN should also be considered in the differential diagnosis as the cause of symptoms and the first manifestation of the disease.