title: Tumor enucleation specimens of small renal tumors more frequently have a positive surgical margin than partial nephrectomy specimens, but this is not associated with local tumor recurrence.
abstract: Approaches to nephron-sparing surgeries (NSS) of renal lesions include partial nephrectomy (PN) and tumor enucleation (TE). Our objective was to examine the pathology of the pseudocapsule and status of the surgical margin in small renal masses treated by NSS and to correlate these findings with the surgical and oncological outcomes. All consecutive renal TE and PN specimens obtained during the period between January 2012 and December 2014, of which clinical follow-up was available, were included in this study. Pathologic features and clinical data were reviewed and analyzed. A total of 117 NSS specimens (59 EN, 58 PN) were reviewed. Clear cell renal cell carcinomas and paraganglioma had the thickest pseudocapsules (0.36 mm), while angiomyolipomas did not form a well-defined pseudocapsule. Other tumors were intermediate in their characteristics. The positive margin rate for TE and PN was 17.2 and 0 %, respectively. Compared to PN, TE involved a significantly shorter procedure time, less blood loss, and fewer post-operative complications. None of the patients from either group was found to have a local recurrence after follow-up imaging. Although positive surgical margins were more frequently seen in TE specimens, local tumor recurrence was comparable to PN. Thus, TE is a reasonable choice for pT1 renal tumors, especially for those without a prominent infiltrative growth pattern.
authors: Department of Pathology and Laboratory Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA.
authors: Lu
authors: L
authors: Wang
authors: Department of Pathology and Laboratory Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA.
authors: Ian
authors: I
authors: Hughes
authors: Strich School of Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA.
authors: Connor
authors: C
authors: Snarskis
authors: Strich School of Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA.
authors: Helyn
authors: H
authors: Alvarez
authors: Department of Pathology and Laboratory Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA.
authors: Jingyang
authors: J
authors: Feng
authors: Department of Urology, Loyola University Medical Center, Bldg 54, Rm 247, 2160 S 1st Ave, Chicago, IL, 60153, USA. gogupta@lumc.edu.|Department of Surgery, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA. gogupta@lumc.edu.|Department of Radiology, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA. gogupta@lumc.edu.
authors: Gopal N
authors: GN
authors: Gupta
authors: Department of Pathology and Laboratory Medicine, Loyola University Medical Center, 2160 S 1st Ave, Chicago, IL, 60153, USA. mpicken@luc.edu.|Department of Pathology, Loyola University Medical Center, BLdg 110, Rm 2242, 2160 S 1st Ave, Maywood, IL, 60153, USA. mpicken@luc.edu.
authors: Maria M
authors: MM
authors: Picken
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002292:Carcinoma, Renal Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D000072662:Margins of Excision; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009392:Nephrectomy / Q000379:methods; D016896:Treatment Outcome; D055815:Young Adult
keywords: Nephron-sparing surgeries; Pseudocapsule; Small renal tumor; Surgical and oncologic outcome; Surgical margin