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Trichoepithelioma is a benign neoformation with hair follicle differentiation that may clinically present in solitary, multiple or desmoplastic form. From a histopathological standpoint, it poses some diagnostic difficulties with basal cell carcinoma. We present two cases of desmoplastic trichoepithelioma, a rare adnexal tumor whose incidence is estimated at 2 per 10,000. Desmoplastic trichoepithelioma is a benign lesion, clinically and histologically similar to other dermatoses, and presents a true diagnostic challenge.

Extracorporeal shock wave lithotripsy is the treatment of choice in most cases of urinary calculi, with the estimation that open surgery is only necessary in 5% of all cases. In most cases, the complications derived from this technique are slight, transitory and of little clinical importance, with isolated cases of serious urological or extraurological injury. These complications are either caused by the action of the stone itself or its fragments, or by the action of shock waves. We present a case of ureteral rupture following treatment of a ureteral calculus using extracorporeal shock wave lithotripsy which led to a periureteral retroperitoneal abscess that was treated by nephroureterectomy.