lump, swelling
瘤 centers on an abnormal raised mass on the body: a lump or swelling, typically a benign growth like a bump or tumor.
瘤 combines 疒 (sickness) with 留, which likely contributes the sound リュウ and may suggest something staying or accumulating, like a lump that persists.
The sickness enclosure 疒 wraps around 留, like a lump that stays (留) on the body as a swelling.
For リュウ, imagine a lump that looks like a small, round 'ryu' (as in a made-up word for a bump) staying on the skin: ryu -> リュウ, and the lump remains.
bump; lump; protuberance; swelling
aneurysm; aneurism
aortic aneurysm
unruptured cerebral aneurysm
Blainville's beaked whale (Mesoplodon densirostris); dense-beaked whale
zebu; humped cattle
mute swan (Cygnus olor)
kaffir lime (Citrus hystrix)
(adult male) Asian sheepshead wrasse (Semicossyphus reticulatus)
cecidium; gall
atheroma
varicocele
varicocelectomy
varicocelectomy; varicocele surgery
cerebral aneurysm
lump; mass; tumor (tumour)
bunion
abdominal aortic aneurysm
hematocele
varix; varicosity; varicose vein