Intranodal palisaded myofibroblastoma: a case report from an unusual site

Abstract

Intranodal palisaded myofibroblastoma is a rare lymph node benign tumor, of unknown pathogenesis. Although benign, this lesion is frequently confused with metastatic lesions, especially in atypical sites. We report a  39-year-old man with a history of testicular malignant mixed germ cell tumor, presented with abdominal  painless mass. The computed tomography of the abdomen confirmed the presence of 180 × 140 mm2 mass in the retroperitoneum with  lympadenopathy on the right measuring 20 x 15 mm. The patient underwent  exploratory laparotomy, and a surgical exerese of the retroperitoneeum lymph node  was made. Histological and immunohistochemical examination confirmed the diagnosis of intranodal palissaded myofibroblastoma. This entity has been previously, only once, in retroperitoneal region. Despite to the rarity of this  neoplasm, we discuss clinicopathologic features and differential diagnosis.

Key words: Intranodal palisaded myofibroblastoma, retroperitoneum, lymph node