Metsähovi radio maps at 87 GHz (3.5 mm) from 1996-1998 have been analysed and compared with nearly-simultaneous SOHO/EIT, TRACE, and YOHKOH/SXT images. Emphasis was given to comparing polar radio brightenings with features seen in EUV, but also radio depressions and their counterparts--like coronal holes--were analysed. The high latitude radio enhancements were found to correlate with bright points, polar plume bases, and bright diffuse structures seen in EUV. No uniform brightness (or darkness) was found inside coronal holes: the holes appeared generally as radio dark but with local brightenings inside them. The observed radio features were later verified by calculations, using temperatures and densities derived from EUV and soft X-ray observations. Significant limb brightening at 87 GHz was also detected in the Metsähovi solar maps for the first time.