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Dive into the research topics where Lilian Chen is active.

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Featured researches published by Lilian Chen.


Journal of The American College of Surgeons | 2012

Application of Total Care Time and Payment per Unit Time Model for Physician Reimbursement for Common General Surgery Operations

Abhishek Chatterjee; Stefan D. Holubar; Sean Figy; Lilian Chen; Shirley A. Montagne; Joseph M. Rosen; Joseph P. DeSimone

BACKGROUND The relative value unit system relies on subjective measures of physician input in the care of patients. A payment per unit time model incorporates surgeon reimbursement to the total care time spent in the operating room, postoperative in-house, and clinic time to define payment per unit time. We aimed to compare common general surgery operations by using the total care time and payment per unit time method in order to demonstrate a more objective measurement for physician reimbursement. STUDY DESIGN Average total physician payment per case was obtained for 5 outpatient operations and 4 inpatient operations in general surgery. Total care time was defined as the sum of operative time, 30 minutes per hospital day, and 30 minutes per office visit for each operation. Payment per unit time was calculated by dividing the physician reimbursement per case by the total care time. RESULTS Total care time, physician payment per case, and payment per unit time for each type of operation demonstrated that an average payment per time spent for inpatient operations was


Journal of Surgical Research | 2017

Resident and fellow participation in Thyroid and Parathyroid surgery: an ACS-NSQIP clinical outcomes analysis

Timothy Feeney; Lori Lyn Price; Lilian Chen; Roger A. Graham; Abhishek Chatterjee

455.73 and slightly more at


Case Reports in Gastroenterology | 2016

Appendiceal Adenocarcinoma Presenting as a Rectal Polyp

Erin Fitzgerald; Lilian Chen; Moises Guelrud; Harmony Allison; Tao Zuo; Yvelisse Suarez; James Yoo

467.51 for outpatient operations. Partial colectomy with primary anastomosis had the longest total care time (8.98 hours) and the least payment per unit time (


Journal of surgical case reports | 2018

Unique surgical approach to a twisted ileal-anal pouch

Hannah Buettner; Maria X. Kiely; Mengdi Yao; James Yoo; Lilian Chen

188.52). Laparoscopic gastric bypass had the highest payment per time (


Clinical Case Reports | 2018

Pedunculated small bowel lipoma with heterotopic pancreas causing intussusception

Marianna Papageorge; Abhijeet Waghray; Lilian Chen; James Yoo

707.30). CONCLUSIONS The total care time and payment per unit time method can be used as an adjunct to compare reimbursement among different operations on an institutional level as well as on a national level. Although many operations have similar payment trends based on time spent by the surgeon, payment differences using this methodology are seen and may be in need of further review.


Case Reports in Surgery | 2018

Epiploic Appendagitis Mimicking Recurrent Diverticulitis

R. Plummer; Y. Sekigami; Lilian Chen; James Yoo

BACKGROUND The effect of decreased overall hours of training in surgical specialties is still being examined. Of particular interest is the safety of patients undergoing surgeries with trainee surgeons. The aim of this study was to identify if there were significant differences in outcomes of patients undergoing commonly performed thyroid and parathyroid surgeries when trainees were involved. MATERIALS AND METHODS Postoperative complication rates, length of stay (LOS), and total operation time (OT) data were gathered from the American College of Surgeons National Surgical Quality Improvement Project database. The cases were identified by CPT code and were divided based on the training level of the participating resident surgeon: Junior (postgraduate year [PGY] 1-2), senior (PGY 3-5), fellow (PGY >5), as well as an attending-only group where no resident was present. We compared the clinical outcomes, LOS, and OT in each trainee group to the attending-only group as the reference. RESULTS A total of 84,711 cases were identified of which 45.33% involved trainee participation. Odds ratios (ORs) and 95% confidence interval for overall, neurologic, and bleeding complications were calculated. No difference in the odds of overall patient complications or neurologic complications was observed. A decrease in the odds of bleedings complications when a junior or senior trainee was present was observed. Overall complications in operations including a junior trainee (PGY 1-2) had an OR of 1.04 (0.85, 1.29), a senior trainee (PGY 3-5) had an OR of 1.00 (0.89, 1.13), and a fellow had an OR of 0.98 (0.74, 1.31). Mean OT was found to be significantly different between attending only and junior and senior trainees. There was no significant difference in OT between fellows and attending only. LOS did not meaningfully differ across groups. CONCLUSIONS In three commonly performed thyroid and parathyroid operations, there is not an increased overall or neurologic complication odds when a surgical trainee is involved; there are decreased odds of a bleeding complication.


Surgical Endoscopy and Other Interventional Techniques | 2010

Opportunity cost in the evaluation of surgical innovations: a case study of laparoscopic versus open colectomy

Abhishek Chatterjee; Lilian Chen; Elie A. Goldenberg; Harold Bae; Samuel R.G. Finlayson

Appendiceal adenocarcinoma typically presents as an incidentally noted appendiceal mass, or with symptoms of right lower quadrant pain that can mimic appendicitis, but local involvement of adjacent organs is uncommon, particularly as the presenting sign. We report on a case of a primary appendiceal cancer initially diagnosed as a rectal polyp based on its appearance in the rectal lumen. The management of the patient was in keeping with standard practice for a rectal polyp, and the diagnosis of appendiceal adenocarcinoma was made intraoperatively. The operative strategy had to be adjusted due to this unexpected finding. Although there are published cases of appendiceal adenocarcinoma inducing intussusception and thus mimicking a cecal polyp, there are no reports in the literature describing invasion of the appendix through the rectal wall and thus mimicking a rectal polyp. The patient is a 75-year-old female who presented with spontaneous hematochezia and, on colonoscopy, was noted to have a rectal polyp that appeared to be located within a diverticulum. When endoscopic mucosal resection was not successful, she was referred to colorectal surgery for a low anterior resection. Preoperative imaging was notable for an enlarged appendix adjacent to the rectum. Intraoperatively, the appendix was found to be densely adherent to the right lateral rectal wall. An en bloc resection of the distal sigmoid colon, proximal rectum and appendix was performed, with pathology demonstrating appendiceal adenocarcinoma that invaded through the rectal wall. The prognosis in this type of malignancy weighs heavily on whether or not perforation and spread throughout the peritoneal cavity have occurred. In this unusual presentation, an en bloc resection is required for a complete resection and to minimize the risk of peritoneal spread. Unusual appearing polyps do not always originate from the bowel wall. Abnormal radiographic findings adjacent to an area of gastrointestinal pathology may signify locally advanced disease from a surrounding organ that secondarily involves the gastrointestinal tract. These findings warrant further investigation prior to any intervention to ensure appropriate treatment.


Annals of Surgical Oncology | 2016

Early Postoperative Outcomes in Breast Conservation Surgery Versus Simple Mastectomy with Implant Reconstruction: A NSQIP Analysis of 11,645 Patients

Bryan Pyfer; Abhishek Chatterjee; Lilian Chen; John F. Nigriny; Brian J. Czerniecki; Julia Tchou; Carla S. Fisher

Abstract Total proctocolectomy with ileal pouch-anal anastomosis can restore gastrointestinal continuity in patients requiring colectomy for ulcerative colitis, however, it can be associated with high morbidity. Reoperation for pouch-related complications is technically challenging and often leads to deterioration of pouch function or need for permanent stoma. We report a case of acute on chronic small bowel obstruction secondary to a 360-degree twist in the small bowel introduced during creation of the ileal-anal pouch. Our novel approach at repair has not been reported in past literature which included resection and re-anastomosis of the small bowel proximal to the pouch allowing for pouch salvage with return to function.


Journal of The American College of Surgeons | 2015

Resident and Fellow Participation in Breast Surgery: An American College of Surgeons NSQIP Clinical Outcomes Analysis

Abhishek Chatterjee; Bryan Pyfer; Lilian Chen; Brian J. Czerniecki; Julia Tchou; Carla S. Fisher

Small bowel intussusception is a relatively uncommon cause of abdominal pain. The diagnosis is often delayed due to vague symptoms and limitations with current endoscopic and radiographic approaches to evaluate the small bowel lumen. Treatment often requires surgical resection, which can usually be performed in a minimally invasive fashion.


Advances in Breast Cancer Research | 2018

A Cost-Utility Analysis Comparing Oncoplastic Breast Surgery to Standard Lumpectomy in Large Breasted Women

Abhishek Chatterjee; Anaeze C. Offodile; Ammar Asban; Raquel A. Minasian; Albert Losken; Roger A. Graham; Lilian Chen; Brian J. Czerniecki; Carla S. Fisher

Here, we report a case in which a patient with an extensive history of diverticulitis of the sigmoid colon presented with left lower quadrant abdominal pain similar to her previous episodes of diverticulitis. An initial diagnosis of diverticulitis was made based on her history and exam, intravenous antibiotics were given, and an elective surgical resection was considered. However, a subsequent CT scan revealed epiploic appendagitis with no evidence of diverticulitis. Though uncommon, in patients with a history of recurrent diverticulitis, alternative causes of left lower quadrant abdominal pain such as epiploic appendagitis should be considered as this may alter future treatment decisions.

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Carla S. Fisher

University of Pennsylvania

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Ammar Asban

University of Alabama at Birmingham

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Julia Tchou

University of Pennsylvania

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