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1.
AJR Am J Roentgenol ; 217(1): 135-140, 2021 07.
Article in English | MEDLINE | ID: mdl-32845714

ABSTRACT

BACKGROUND. Incidental homogeneous renal masses are frequently encountered at portal venous phase CT. The American College of Radiology Incidental Findings Committee's white paper on renal masses recommends additional imaging for incidental homogeneous renal masses greater than 20 HU, but single-center data and the Bosniak classification version 2019 suggest the optimal attenuation threshold for detecting solid masses should be higher. OBJECTIVE. The purpose of this article is to determine the clinical importance of small (10-40 mm) incidentally detected homogeneous renal masses measuring 21-39 HU at portal venous phase CT. METHODS. We performed a 12-institution retrospective cohort study of adult patients who underwent portal venous phase CT for a nonrenal indication. The date of the first CT at each institution ranged from January 1, 2008, to January 1, 2014. Consecutive reports from 12,167 portal venous phase CT examinations were evaluated. Images were reviewed for 4529 CT examinations whose report described a focal renal mass. Eligible masses were 10-40 mm, well-defined, subjectively homogeneous, and 21-39 HU. Of these, masses that were shown to be solid without macroscopic fat; classified as Bosniak IIF, III, or IV; or confirmed to be malignant were considered clinically important. The reference standard was renal mass protocol CT or MRI, ultrasound of definitively benign cysts or solid masses, single-phase contrast-enhanced CT or unenhanced MRI showing no growth or morphologic change for 5 years or more, or clinical follow-up 5 years or greater. A reference standard was available for 346 masses in 300 patients. The 95% CIs were calculated using the binomial exact method. RESULTS. Eligible masses were identified in 4.2% of patients (514/12,167; 95% CI, 3.9-4.6%). Of 346 masses with a reference standard, none were clinically important (0%; 95% CI, 0-0.9%). Mean mass size was 17 mm; 72% (248/346) measured 21-30 HU, and 28% (98/346) measured 31-39 HU. CONCLUSION. Incidental small homogeneous renal masses measuring 21-39 HU at portal venous phase CT are common and highly likely benign. CLINICAL IMPACT. The change in attenuation threshold signifying the need for additional imaging from greater than 20 HU to greater than 30 HU proposed by the Bosniak classification version 2019 is supported.


Subject(s)
Incidental Findings , Kidney Neoplasms/diagnostic imaging , Tomography, X-Ray Computed/methods , Adult , Cohort Studies , Female , Humans , Kidney/diagnostic imaging , Male , Middle Aged , Portal Vein , Retrospective Studies
2.
Radiol Case Rep ; 16(1): 205-209, 2021 Jan.
Article in English | MEDLINE | ID: mdl-33294090

ABSTRACT

We report a case of primary breast lymphoma which was incidentally detected in a 71 year-old-female while investigating for pulmonary embolism with Computed tomography angiograph (CTA) of the chest. Primary breast lymphoma has no specific imaging features however may have better prognosis than breast carcinoma and management is non-surgical.

3.
AJR Am J Roentgenol ; 209(4): 797-799, 2017 Oct.
Article in English | MEDLINE | ID: mdl-28742383

ABSTRACT

OBJECTIVE: Hydrogel spacers have a novel role in the treatment of low- and intermediate-risk prostate cancer with dose-escalated radiation therapy. Given the growing number of patients undergoing treatment with radiation therapy, the use of hydrogel spacers is expected to increase. The purpose of this article is to review what a radiologist needs to know about the imaging of hydrogel spacers, including MRI technique and appearance on CT and MRI. CONCLUSION: MRI has a critical role in the evaluation of hydrogel spacer placement and is used to facilitate contouring by the radiation oncologist. The radiologist should be familiar with the imaging appearance of hydrogel spacers on CT and MRI to avoid interpretation pitfalls and errors.


Subject(s)
Absorbable Implants , Hydrogel, Polyethylene Glycol Dimethacrylate , Magnetic Resonance Imaging , Prostatic Neoplasms/radiotherapy , Aged , Humans , Magnetic Resonance Imaging/methods , Male , Radiology/methods , Radiotherapy Dosage
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