Extra-spinal incidental findings at lumbar spine MRI in the general population: a large cohort study

Insights into Imaging

Table 1 List of IF classified according to the organ/system involved

Organ/system	Finding
Vascular System	AP = atheromasic plaque
	AD = aortic Dilation^a
	AA = aortic Aneurysm^b
	V = pelvic Varicocele
Lymphatic System	L = enlarged Lymph nodes^c
Kidney	C = cystic lesion^d
	S = solid lesion
	L = lithiasis
	H = hydronephrosis
Uterus	CB = cystic benign lesion^d
	SB = solid benign lesion^e
	A = anatomic abnormality^f
	UD = cavity dilation
Ovaries	CL = cystic Lesion^d
	SL = solid lesion
	PS = post-surgery
Prostate	PL = bladder wall thickening or prostatic lesion
Bladder
Bowel	D = diverticulosis
Bowel	CT = colo-rectal wall thickening^g
Liver	SC = Simple cysts^d
	HL = T2 hyperintense lesion
	BL = biliary lithiasis
	BD = biliary duct dilation
Spleen	AS = accessory spleen
Adrenal glands	AH = hyperplasia
Adrenal glands	ASL = solid lesion
Fluid	F = abdominal-pelvic fluid

^aTransverse diameter from 2.6 to 3.0 cm
^bTransverse diameter more than 3.0 cm
^cLymph nodes (pre-sacral in all cases) were considered enlarged with the largest diameter greater than 5 mm
^dKidney, liver, uterus and ovary lesions that showed net hyperintensity on T2-weighted and net hypointensity on T1-weighted images, with well-defined margins were considered presumably benign without the need of further work-up
^eSolid benign lesions were classifid as E2 if homogeneously hypointense on T1- and T2-weighted images, suggesting fibromiomas
^fAnatomical abnormalities were: retroverse uterus, uterus didelphis, bicornuate uterus, septated uterus
^gColorectal wall thickening was not defined because colorectal enema was not performed; any wall thickening considered suspicious by consensus of the two observers was included in the study