** Shares of medical diagnostics co Lantheus Holdings LNTH.O fall 20% to over 2-month low of $83.71

** Co forecast 2025 sales to be between $1.55 bln and $1.59 bln; analysts were expecting 2025 sales to be $1.59 bln - data compiled by LSEG

** Co forecast 2025 adj. EPS between $6.60 and $6.70; analysts were expecting it to be $7.08/shr

** Co posts Q1 sales of $372.8 mln, below analysts' est. of $379 mln

** Reports Q1 adj. profit of $1.53/shr, below est. of $1.66/shr

** Including session moves, stock down 7% YTD

(Reporting by Kamal Choudhury in Bengaluru)

((Kamal.Choudhury@thomsonreuters.com;))