Enchondromas are benign, solitary bone tumors originating from hyaline cartilage, that are usually located in the upper and lower extremities. They are equally distributed in both genders and in all age groups. 40 -65% of enchondromal cases are found in metacarpal bones. The most common involvement is the proximal phalanx, metacarpal bone, and distal phalanx. Involvement of distal phalanx in patients with enchondroma is rare. Our aim in this study was to investigate the preoperative neutrophil

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... ount, white blood cell count, red cell distribution width, mean corpu scular volume, platelet count, hemoglobin, hematocrit and NLR values, and make a comparison with a control group. The most commonly involved sites are also investigated in the patient group. This retrospective study investigated the preoperative WBC, neutrophil, lymphocyte, RDW, MCV, NLR values in 20 patients and 20 controls, and compared the frequency of the involved sites among patients with enchondroma. WBC, neutrophil count, MCV, RDW were not found statistically significant. NLR ratios were different be tween groups, but not statistically significant. Involvement of the proximal phalanx was statistically significantly higher (p<0.05). This is the first study investigating the pre-operative RDW, MCV, NLR, PLT, Hgb, Hct and WBC in patients with enchondroma. Although there is no statistically significant difference when these results are compared we suggest that they should be studied in larger groups and in clinical tests, so that the malignancy potential may be predicted.