Introduction Deep space infections defined as infections of the thenar space login to view 1 more bullet hypothenar space midpalmar space login to view 1 more bullet Collar button abscess an abscess that occurs in the web space between fingers Anatomy Thenar space a bursa (potential space) just palmar to adductor pollicis and dorsal to flexor tendons separated from midpalmar potential space by a fascial septum Midpalmar space located dorsal and radial to hypothenar space Hypothenar space located palmar to fifth metacarpal, dorsal and radial to hypothenar fascia, ulnar to hypothenar septum Presentation History may or may not have penetrating trauma Symptoms pain swelling Physical exam pain with flexion of fingers thenar login to view 1 more bullet hypothenar login to view 1 more bullet midpalmar login to view 1 more bullet thenar and midpalmar spaces often have loss of palmar concavity secondary to swelling Imaging Radiographs indicated if there is suspicion for a foreign body MRI indications help define extent of infection Treatment Operative incision and drainage in conjunction with IV antibiotics indications login to view 1 more bullet technique login to view 2 more bullets