noun
anal fistula
Medical term for an abnormal tunnel between the anal canal and the skin near the anus.
痔瘻の治療には手術が必要なことが多い。
Surgery is often necessary to treat an anal fistula.
痔 is a general term for hemorrhoids, while 痔瘻 specifically refers to an anal fistula, a more severe condition.
Compound of 痔 (ji, 'hemorrhoids') and 瘻 (rō, 'fistula'). The kanji 瘻 is a medical character for an abnormal passage, and its reading ろう is sometimes written in hiragana as ろう.