A case of concomitant psoriasis and multiple sclerosis: Secukinumab and rituximab exert dichotomous effects in two autoimmune conditions.

BACKGROUND: Multiple sclerosis (MS) and psoriasis vulgaris (PV) are two disorders with autoimmune pathophysiology and a supposed altered T helper (TH ) cell response.

OBJECTIVE: To report a case of concomitant relapsing remitting MS and PV treated with different immunomodulatory medications, particularly secukinumab and rituximab.

METHODS: Case report.

RESULTS: In a 68-year-old woman diagnosed with MS and PV, secukinumab alleviated the dermatological condition, but could not control neuroinflammation. Rituximab treatment halted MS activity, but led to a flare-up of dermatological inflammation.

CONCLUSION: The presented case suggests that the pathomechanisms of MS and PV differ regarding involvement of TH and B cells with implications for therapeutic approaches.