A retroperitoneal tumors is uncommon and neurofibromas still rarer. Solitary neurofibromas are frequently detected in the skin, appendix, stomach and jejunum. However, it has rarely been reported as occurring in the retroperitoneum. Most NST’s are small solitary and benign and rarely exceed 6 cm in diameter. Symptoms do not appear until they have attained gigantic dimension or start compressing surrounding structure. A 17yr old male patient presented with a painless lump in the left lumbar region for last 6 months. A lump is palpable in the left lumbar region of about (10x8) cm. The lump is retroperitoneal in type and not mobile. Another lump of about (5x3) cm. is palpable in the left hypochondriac region. This lump is also not mobile and retroperitoneal in type. Laparotomy followed by Excision of the lumps done. Histopathology shows Neurofibroma; diffuse type.