preferred_name: Specimen from colon obtained by rectal/rectosigmoid (low anterior) resection
preferred_name_lc: specimen from colon obtained by rectal/rectosigmoid (low anterior) resection
label: Specimen from colon obtained by rectal/rectosigmoid (low anterior) resection
label_lc: specimen from colon obtained by rectal/rectosigmoid (low anterior) resection