It’s even tighter than it looks ;)

SELECT * FROM gallery2 WHERE topic_id="517688" UNION SELECT * FROM gallery2 WHERE topic_id="1761078" UNION SELECT * FROM gallery2 WHERE topic_id="505162" UNION SELECT * FROM gallery2 WHERE topic_id="719623" UNION SELECT * FROM gallery2 WHERE topic_id="1354852" UNION SELECT * FROM gallery2 WHERE topic_id="12575" UNION SELECT * FROM gallery2 WHERE topic_id="504490" UNION SELECT * FROM gallery2 WHERE topic_id="180504" UNION SELECT * FROM gallery2 WHERE topic_id="492207" UNION SELECT * FROM gallery2 WHERE topic_id="413794" UNION SELECT * FROM gallery2 WHERE topic_id="22666" UNION SELECT * FROM gallery2 WHERE topic_id="1586776" UNION SELECT * FROM gallery2 WHERE topic_id="1330246" UNION SELECT * FROM gallery2 WHERE topic_id="1020181" UNION SELECT * FROM gallery2 WHERE topic_id="857175" UNION SELECT * FROM gallery2 WHERE topic_id="1729111"