Table 2.

Differential diagnosis table for calcific tendinosis of the posterior navicular tendon and corresponding imaging findings.

Disease	X-Ray	Ultrasound	MRI – T1	MRI – T2	Pattern of enhancement With GAD	Scintigraphy
Calcific tendonitis of tibialis posterior tendon	Calcification	Calcification in tendon	Low signal	Low signal	none	No uptake
Gout	Calcification in soft tissue and erosions	Calcification in soft tissues and erosions	Low signal in soft tissues. May have high signal marrow reactive changes	Low signal	Increased enhancement if active inflammation and marrow reaction	Increased uptake if active
Infection	Soft tissue swelling, may have gas in soft tissue and bone destruction	Soft tissue oedema and collections	Low signal	High signal	Increased enhancement in soft tissues and any affected bone	Increased uptake
Accessory navicular syndrome	Accessory bone. May be sclerotic	Soft tissue inflammation	Low signal or normal marrow signal	High signal marrow oedema or normal marrow signal	Increased enhancement if inflammation	Increased uptake if inflammation
Trauma with bruising	Soft tissue swelling	Oedema and soft tissue swelling	Low signal	High signal	Increased enhancement if recent trauma	Increased uptake if inflamed