Acquired tumours of the nonpigmented ciliary body epithelium are rare. We present herein a case of low-grade adenocarcinoma in order to stress the problems related to the clinical diagnosis. The tumour in our case was circumscribed, localised on the ciliary body, and nonpigmented. The height of the tumour, measured with ultrasound biomicroscopy, was 3.5 mm. The internal reflectivity of the tumor was homogeneous with low attenuation. The tumour was surgically excised with an uneventful iridocyclectomy. Both clinical presentation and preoperative examinations allowed to circumscribe the correct diagnosis which could be confirmed only with histology.