E1438. Simple to Complex Collections: Demystifying the Many Faces of Collections Within the Body
  1. Steven Chua; UT Houston
  2. Leela Chaudhary; UT Houston
Collections be they simple or complex are frequently encountered in the imaging of the abdomen and pelvis. The goal of this educational exhibit is to provide an interesting imaging atlas of the myriad of collections to allow the radiologist to correctly diagnose, describe and identify the collection and compartment in which the disease process is taking place so that timely and effective therapeutic and treatment measures can be effected to mitigate and decrease the morbidity and mortality of patients. The intent is to educate the trainee radiologist and others to improve and increase diagnostic acumen so as to direct efficacious treatments to improve outcome and reduce mortality and morbidity of patients.

Educational Goals / Teaching Points
1. Briefly review the anatomy of the peritoneum, retroperitoneum and extraperitoneum. 2. Understand the etiologies of intra-peritoneal/retroperitoneal/extra-peritoneal collections. 3. Recognize the imaging findings of most common intra-abdominal fluid collections and associated pathological process, benign versus malignant. 4. Understand use of CT as a predominant and an invaluable modality in providing important anatomic details and early diagnosis. 5. Describe the myriad of different collections that can manifest in the different compartments of the body.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Proper localization of collections in the peritoneum, retroperitonum and extraperitoneum are critical to the radiologist and clinicians so that the patient can receive the appropriate treatment and intervention measures effectively to improve outcome and reduce mortality and morbidity. The anatomy of these compartments will be discussed. CT is most often utilized to pinpoint the compartment the collection is in and will be the main modality utilized in this exhibit. Nuclear medicine and sometimes MRI may be used as adjunct modalities to troubleshoot more complicated cases. The types of fluid collections discussed would include simple collections, abscesses, bilomas, seromas, hematomas, urinomas, postsurgical leaks, perforations, lymphoceles, peripancreatic collections, pseudocysts, walled-off collections, pseudomyxomatous peritonei, and other complex loculated collections of fluid and fluid-air in the intraperitoneal, retroperitoneal and extraperitoneal locations. Mimics/masses that can confound collections will also be described. The goal of the exhibit to present the myriad of collections that can exist in the 3 compartments and to familiarize trainees to these pathological processes.

In addition to increasing the diagnostic acumen of radiologist, the correct identification of a collection in the proper compartment is critical to diagnosing and understanding the etiology and pathophysiology of the disease process so that timely and effective therapeutic and intervention methods can be affected to mitigate this condition and to improve the health of patients, improve outcome and decrease mortality and morbidity.