A urinary stone from the early medieval site of Riner, Catalonia.

Objective: This paper presents the differential diagnosis of a calcified mass found in the pelvic cavity of an adult male dating to the 10th century AD.

Materials: Skeletal remains of an adult male exhumed from the cemetery associated with the early medieval church of Riner (Solsonès, Catalonia).

Methods: The structure and composition of the mass were examined by x-ray imaging, microscopic stereoscopy and Fourier transform infrared spectrometry analysis.