Table 1.

The differential diagnosis using triphasic bone scan

Phase	Malignancy [13]	Osteomyelitis [13]	Stress fracture [14]	IMOS [1], [our cases]
Phase 1: Vascular phase	Enhanced blood flow	Enhanced blood flow	Relatively poor sensitivity	Absent
Phase 2: Soft tissue (Blood pool)	Soft-tissue hyperemia	Soft-tissue hyperemia	Lateral/medial blood pool imaging was positive and significantly better than anterior/posterior images	Absent or slightly uptake
Phase 3: Delayed (bone)	Increased uptake	Increased uptake	Focal increased tracer uptake	Fusiform-shaped intense area of the tracer uptake