Adrenal Imaging Features Predict Malignancy Better than Tumor Size.

Abstract:

INTRODUCTION:In adrenal tumors, size ≥ 4 cm has been an indication for adrenalectomy due to concern for malignancy. We compared mass size to imaging features (ImF) for accuracy in diagnosing adrenal malignancy. METHODS:Data were retrieved for 112 consecutive patients who had adrenalectomy from January 2011 to August 2014. ImF was classified as nonbenign if HU > 10 on unenhanced CT scan or if loss of signal on out-of-phase imaging was absent on chemical-shift MRI. Indications for resection included hormonal hypersecretion, nonbenign ImF, and/or size ≥ 4 cm. RESULTS:Of 113 resected adrenals, 37 % were functional. Histologic malignancy occurred in 18 % (20/113) and included 3 adrenocortical carcinomas (ACC), 1 epithelioid liposarcoma, 1 lymphoma, 1 malignant nerve sheath tumor, and 14 adrenal metastases. Patients with malignancies were older (mean age, 60 ± 13 vs. 51 ± 14 years, p = 0.01). Malignant tumors were larger on preoperative imaging (mean 5.3 ± 3.2 vs. 3.9 ± 2.4 cm, p = 0.03). All 20 malignant masses had nonbenign ImF. In predicting malignancy, the sensitivity, specificity, NPV, and PPV of nonbenign ImF was 100, 57, 100, and 33 %, respectively. Size ≥ 4 cm was less predictive with sensitivity, specificity, NPV, and PPV of 55, 61, 86, and 23 %, respectively. If size ≥ 4 cm had been used as the sole criterion for surgery, 45 % of malignancies (9/20) would have been missed including 8 metastases and an ACC. CONCLUSIONS:In resected adrenal tumors, the presence of nonbenign ImF is more sensitive for malignancy than mass size (100 vs. 55 %) with equivalent specificity. Regardless of mass size, adrenalectomy should be strongly considered when non-benign ImF are present.

journal_name

Ann Surg Oncol

authors

Yoo JY,McCoy KL,Carty SE,Stang MT,Armstrong MJ,Howell GM,Bartlett DL,Tublin ME,Yip L

doi

10.1245/s10434-015-4684-z

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

S721-7

eissn

1068-9265

issn

1534-4681

pii

10.1245/s10434-015-4684-z

journal_volume

22 Suppl 3

pub_type

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