also: かんこう
Technical term in anatomy for the interior space of a tubular structure, such as a blood vessel or intestine.
When the lumen of a blood vessel narrows, blood flow worsens.
Digested food passes through the intestinal lumen.
Standard kanji form for the anatomical term 'lumen'.
Alternate reading; less common than かんくう.
Compound of 管 (tube) and 腔 (cavity), directly corresponding to the anatomical concept of a lumen.