In the course of a disinterment of an ancient Avar burial place at Székkutas-Kápolna near Hódmezövásárhely, Hungary, the archaeologist conducting the excavations, Miss Katalin B. Nagy, noticed a lithoid body of oval shape in the pelvis of a skeleton. The find was identified on morphological and chemo-analytical grounds as a bladder stone. In view of its rarity and its palaeopathological interest, it is described in detail. It is also expected to draw the attention of archaeologists to the possibility of similar findings. A brief review of the pertinent literature is given.