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Table 5 CT characteristics of 117 lesions by clinical diagnosis

From: Clinical analysis of adrenal lesions larger than 5 cm in diameter (an analysis of 251 cases)

CT characteristicsBenign adenoma (n = 34)Pheochromocytoma (n = 35)Cortical carcinoma (n = 18)Metastatic carcinoma (n = 23)Gangliocytoma (n = 7)
Diameter (cm) 6.55 ± 1.767.6.1 ± 2.279.37 ± 3.467.53 ± 2.448.18 ± 2.76
ShapeRound32 (94.12%)30 (85.71%)7 (38.89%)13 (56.52%)6 (85.71%)
Lobulated2 (5.88%)2 (5.71%)5 (27.78%)8 (34.78%)0
Infiltrative03 (8.57%)6 (33.33%)2 (8.70%)1 (14.29%)
MarginCircumscribed33 (97.06%)33 (94.29%)7 (38.89%)15 (65.22%)6 (85.71%)
Ill-defined1 (2.94%)2 (5.71%)11 (61.11%)8 (34.78%)1 (14.29%)
HeterogeneityHomogeneous19 (55.88%)2 (5.71%)2 (11.11%)1 (4.35%)6 (85.71%)
Heterogeneous15 (44.12%)33 (94.29%)16 (88.89%)22 (95.65%)1 (14.29%)
NecrosisNegative20 (58.82%)2 (5.71%)6 (33.3%)10 (43.48%)6 (85.71%)
Positive14 (41.18%)33 (94.29%)12 (66.67%)13 (56.52%)1 (14.29%)
Calcifications 14 (41.18%)6 (14.14%)5 (27.78%)00
Pre-contrast attenuation (HU) 23.94 ± 16.1640.17 ± 7.7836.89 ± 10.5932.35 ± 9.0532.86 ± 8.51
Contrast attenuation (HU)Arterial phase50.94 ± 23.0187.46 ± 38.4457.28 ± 17.6755.26 ± 18.8446.86 ± 28.29
Venous phase68.59 ± 31.9591.17 ± 26.7473.44 ± 29.2258.13 ± 16.5550.14 ± 24.12
Delay phase55.32 ± 26.3279.37 ± 16.2569.61 ± 24.7553.48 ± 14.6446.71 ± 17.81