Pancreatic cancer generally develops without earlysymptoms,exceptwhenitisclosetothebileductandcausesbiliary obstruction. Up to two-thirds may be located in thehead of the pancreas. Approximately 30% of cases arerelated to smoking and 20% are associated with the type ofTable 1.
underbelly noun [S]. âº the âweakest or most âunpleasant âpart of something: a âfilm âexposing the âsordid underbelly of âmodern âurban âsociety Small âbusinesses are the âsoft underbelly (= âweakest âparts) of the âeconomy, and they need as much âgovernment âsupport as âpossible.
In forestry and ecology, understory (or understorey, underbrush, undergrowth) comprises plant life growing beneath the forest canopy without penetrating it to any great extent, but above the forest floor. Only a small percentage of light penetrates the canopy so understory vegetation is generally shade tolerant.