This study was undertaken to determine the age, sex, pattern of presentation, histopathology and outcome of management of adult patients with malignant renal tumors (MRT) in Nigeria. Using hospital records, a retrospective study was performed covering the period between January 1997 and December 2006. A total of 18 adult patients had been diagnosed to have MRT during this period. Information extracted and analyzed included the age of the patient, sex, presentation, investigations, type of histopathology, management and duration of follow-up. The mean age of the study patients was 47.5 years (range 16-80 yrs). The male: female ratio was 13 : 5 and the mean duration of symptoms was 43.6 weeks (range 2-104 wks). Sixteen patients (88.9%) presented in advanced stage. Symptoms included loin pain in 17 (94.4%), abdominal swelling in 15 (83.3%), weight-loss in 13 (72.2%) and hematuria in nine (50.0%). Ultrasound and intravenous urography assisted greatly in making the diagnosis. Thirteen patients (72.2%) underwent radical nephrectomy, tumors were not resectable in two (11.1%) and three others (16.7%) were deemed unfit to undergo surgery. The average tumor mass removed at surgery was 1.884 Kg (range 0.48-3.82 Kg). Renal cell carcinoma (RCC) accounted for 13 of the tumors (72.2%). Surgical complications include primary-hemorrhage, septicemia and tumor recurrence in one patient each (7.6%). Morbidity and mortality rates were 7.6% each. The average post-operative hospital stay and follow-up duration were 9.3 days and 37.5 months respectively. Our study suggests that RCC is the major MRT in our community. Most cases still present late with loin pain and swelling, weight loss and hematuria. This late presentation and sarcomatous type of tumor have negative influence on prognosis. Radical nephrectomy is beneficial in operable, locally advanced, non-metastatic MRT.