Myöhäisvaiheessa
Myöhäisvaiheessa is a Finnish expression that translates roughly as "in the late phase" or "in the late stage." It is formed by combining the adjective myöhäinen (late) with vaihe (phase) and the inessive suffix -ssa, indicating location: "in the late phase."
Used primarily in medical contexts to describe diseases or conditions that have progressed to a late stage,
Grammatically, myöhäisvaiheessa is an inessive form, used to denote that something is located in the late phase.
See also: vaihe (phase), myöhäisvaihe (late stage) as a general concept, and related terms such as alkuvaihe