AccessNeurology's Image of the Month Developmental Diseases of the Nervous System Diagnosis What's your diagnosis? Leah Carton Jul 01, 2020 Share Tweet Share Share Molluscum fibrosum nonneural skin tumors of von Recklinghausen disease. Source: Developmental Diseases of the Nervous System, Ropper AH, Samuels MA, Klein JP, Prasad S. Adams and Victor's Principles of Neurology, 11e; 2019.