<prompt> Pseudo rosettes are seen in all exceptNeuroblastomaRetinoblastomaMedulloblastomaThecoma  <response>: Thecomas or theca cell tumors are benign ovarian neoplasms composed only of theca cells. Histogenetically they are classified as sex cord-stromal tumours. They are typically estrogen-producing and they occur in older women mean age 59; 84 after menopause. Refer Robbins page no 1051 