Work

Metastatic Renal Cell Carcinoma to the Luminal Colon with Autoamputation Phenomenon

Year: 2025

Type: article

Abstract: Introduction: Renal cell carcinoma (RCC) arises from the tubular epithelial cells in the cortex. RCC can present with metastatic disease in 25-33% of cases and has the potential to metastasize to every distant organ, with no apparent time limit for metastatic activity. Metastatic RCC to the colon is an infrequent phenomenon, making a new primary colonic adenocarcinoma an important differential. Multiple hypotheses for the mechanism of these metastases exist, including multistep hematogenous dissemination or a diffuse peritoneal seeding from an intra-abdominal or retroperitoneal tumor with colonic microperforations. Additionally, colonic metastases may outgrow their blood supply, leading to spontaneous detachment and passage in stool, a phenomenon known as autoamputation. This phenomenon has been described mostly in adnexa, ovaries, and related tumors such as teratomas, but also in polypoid carcinoma in the colon and rectum. Case Presentation: A 62-year-old male with a past medical history of known metastatic RCC, presented to the emergency department with multiple episodes of hematochezia and passed a large tissue-like mass in his stool. Colonoscopy revealed an ulcerated, obstructing mass in the descending colon with an inconclusive biopsy. However, the pathology from the initial mass passed through the stool revealed a clear cell-type RCC classic histologic pattern. Conclusions: To the authors' knowledge, this is the first reported case of autoamputation phenomena in metastatic RCC to the gastrointestinal (GI) tract. It represents RCC's propensity to metastasize to distant sites and should be considered in the differential diagnosis of lower GI bleed.

Source: Case Reports in Oncology

DOI: 10.1159/000547692

Authors: Harold Bravo Thompson, Het Hirpara, Yasamin Mirzabeigi, Samantha El Warrak, Janaki Sharma

Institutions: University of Miami, Jackson Health System, CU Shah Medical College and Hospital

Language: English

Topic: Renal cell carcinoma treatment

Subfield: Pulmonary and Respiratory Medicine

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $1,170