** Shares of Internal Diagnostics IDX.AX rise as much as 12.9% to A$3.070, their biggest intra-day pct gain since late-February 2024

** Stock hits their highest level since February 17

** Diagnostic imaging services provider reports a 77.4% rise in full-year operating net income after tax of A$31.6 million ($20.5 million)

** Posts 33.7% y/y rise in FY revenue to A$628 mln

** About 3.7 mln shares traded, 4.6x the 30-day average

** YTD, stock up 4.1%, including current session's move

($1 = 1.5389 Australian dollars)

(Reporting by Ananya Verma in Bengaluru)

((ananya.verma@thomsonreuters.com;))