abnormal changes in the lining of the large intestine caused by deposits of a pigment 意味

• 色素｛しきそ｝の沈着｛ちんちゃく｝によって生じる大腸粘膜｛だいちょう ねんまく｝の異常｛いじょう｝な変化｛へんか｝
  

• lining of the large intestine:    大腸｛だいちょう｝の内層｛ないそう｝
• protective lining of the large intestine:    大腸｛だいちょう｝の保護粘膜層｛ほご ねんまく そう｝
• small abnormal pouch in the large intestine:    大腸内｛だいちょう ない｝の異常｛いじょう｝な小嚢｛しょうのう｝