A large, smooth-walled cavity molded from the pressure of a relatively hard, globular, and lobulated tissue mass was found inside the sacrum of the mature female, Imakhetkherresnet. She was the sister of the lector-priest Iufaa, whose unmolested tomb dates to the late 26th Dynasty (prior to 625 BC). The origin of the lesion could be determined unambiguously by macroscopic, radiographic, and histological analysis.