medullary substance的用法和樣例：
例句
- Markers of kidney damage, such as proteinuria or small kidney size, can be observed in many young gout subjects with medullary nephrocalcinosis.
腎臟傷害的標記，例如蛋白尿與腎臟縮小，常可見於年輕的痛風併發腎髓質鈣化症的病人中。 - This rare renal tumor shows differentiation towards medullary collecting tubules.It is usually centered on the medulla with extension towards the cortex.
腎集合管癌較少見，主要發生於腎髓質內，病變可向腎皮質擴展。
