Anesthetized with Iso/O2 via mask induction. No concerns under anesthesia.  Uneventful recovery.  
Radiographs showed nearly complete healing of the humeral fracture. Alignment is good. No concerns for infection. Ok to start destabilization of fixator.

Findings
Findings could indicate the mass is a hematoma or an area of hemorrhage associated with the
healing fracture. Additionally, there could be a poorly exfoliative mass. There are no overt bacterial
organisms observed.
(Whole resport in main text box).

In extended right caudocranial and extended right lateral view there are concerns regarding loss of cortex and lytic region surrounding the exit site of the most proximal external fixator pin. The appearance of the cortex appears to be more than a suspected halo artifact surrounding the pin, and there is concern of bacterial infiltration to the site. An ultrasound guided fine needle aspirate was taken from the site and submitted for cytology, anaerobic, and aerobic culture and susceptibility. 

Pre-surgical radiographs were performed. These radiographs confirmed
a diaphyseal humeral fracture, but also revealed numerous comminuted
portions of the fracture. It was decided that we would proceed
with surgery. Patient was placed in ventral recumbency and the
wing was prepped from shoulder to the elbow joint. An incision
was made above the fracture site. An IM pin was placed in a retrograde
fashion. The IM pin was inserted first into the proximal fragment,
exiting at the pectoral crest. The fracture was then reduced
and the pin was then driven into the distal fragment. The incision
was sutured closed with 5-0 PDS. 2 ESF pins were placed, one
in the proximal portion of the proximal fragment and one in the
distal portion of the distal fragment. An external fixator was
then connected to the ESF pins and the IM pin. The incision site
was cleaned with betadine and triple antibiotic ointment was
placed on the site of each pin. Telfa pads were placed around
each pin location and the fixator was wrapped with cast padding
and vet wrap. The right wing was then placed in a wing to body
wrap with silk tape.