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The high risk of lawsuits weighs heavily on obstetricians too.
Literal
Lawsuit-risk [genitive-の] highness [also-も] obstetricians [onto-に] bears-down.
An analytical observation about the litigation burden in obstetrics. 訴訟リスク is a hybrid compound: 訴訟 (Sino-Japanese for 'lawsuit') + リスク (English loanword for 'risk') — a common pattern in modern business/legal vocabulary where a Sino-Japanese modifier takes an English loanword head. のしかかる is a slightly literary verb meaning 'to weigh down on,' 'to bear heavily upon' — literally '[a weight] comes and sits upon you.' Often used figuratively for responsibility, pressure, or burdens: プレッシャーがのしかかる, 責任がのしかかる. The も ('also,' 'too') signals that the burden of litigation adds to other professional pressures.