Sarcoidosis-like disease mimicking metastases during adjuvant ipilimumab therapy in advanced melanoma patient: CT scan and MRI help in managing difficult clinical decision.

The onset of an autoimmune, sarcoidosis-like reaction during or after treatment with immunomodulatory drugs as Ipilimumab is an atypical but renowned eventuality. Awareness of this scenario and its radiological features helps the Radiologist to avoid misdiagnosis of disease progression. In this case report, we present a patient operated for advanced cutaneous melanoma of the left forearm who developed hilar adenopathies with lung and splenic nodules during therapy with Ipilimumab in adjuvant setting. These findings were at first referred to as disease recurrences. Based on discrepancies between imaging, clinic and blood test findings we decided to put the patient on strict follow-up which showed a spontaneous complete regression on the visceral lesions few months after Ipilimumab withheld.