Metastatic Renal Cell Carcinoma Manifesting as a Gastric Polyp on CT: A Case Report and Literature Review

Gastric metastasis of renal cell carcinoma treated with endoscopic resection: A case report

Gastric metastasis of renal cell carcinoma (RCC) is rarely encountered. The time interval between the primary diagnosis of RCC and the occurrence of gastric metastasis tends to occur after more than 10 years. Clinicians should be diligent in checking the general symptoms of patients for more than 10 years.

Gastrointestinal metastases in renal cell carcinoma: A retrospective multicenter GETUG (Groupe d'Étude des Tumeurs Uro-Génitales) study

BACKGROUND

Among patients with renal cell carcinoma (RCC), bone and visceral metastases have a poor prognosis, while endocrine gland metastases have a more favorable prognosis. Gastrointestinal metastases (GIMs) are rare, and their prognosis is still poorly understood.

OBJECTIVES

To report clinical presentations, patient characteristics, therapeutic strategies, and prognosis of GIMs from RCC.

METHODS

We retrospectively collected data from RCC patients presenting GIMs, in 10 French GETUG centers, between 2000 and 2021.

RESULTS

We identified 74 patients with 87 GIMs, mostly gastric or duodenal. The median age at GIM diagnosis was 69 years and 76% of patients already had other metastases. GIMs occurred after a median duration of 5.4 years (IC95%=[4.2-7.1]) and 1.9 years (IC95%=[1.2-3.8]) from RCC diagnosis and first metastasis, respectively. GIMs were symptomatic in 52 patients (70%), with anemia in 41 patients (55%) and/or gastrointestinal bleeding in 31 patients (42%). Only 22 asymptomatic patients (30%) were fortuitously diagnosed. GIM management consisted of systemic treatment only in 29 GIMs (33%), local treatment only in 23 GIMs (26%), and both local and systemic treatment in 18 GIMs (21%). For 17 GIMs (20%), there was no therapeutic modification. After diagnosis of GIM, median overall survival was 19 months.

CONCLUSION

We report the largest retrospective cohort of GIMs in RCC patients. They should be suspected in case of anemia or gastrointestinal bleeding in any patient with a history of RCC. Their management varies widely depending on their location in the digestive tract and whether or not they are symptomatic.

Discovery of Gastric Metastases From Primary Renal Cell Carcinoma Through MRI: A Case Report

Gastric metastases from primary renal cell carcinoma (RCC) are rare and poorly documented in the existing literature. This case report presents the clinical course of a 65-year-old male with multi-metastatic clear cell RCC (ccRCC) who was incidentally found to have stomach metastases during follow-up magnetic resonance imaging (MRI). Gastric metastases from ccRCC are typically associated with other metastatic sites. They often emerge at an advanced stage of the disease, indicating a poor prognosis. It is therefore important to consider gastric metastases as a potential site of involvement in RCC patients. MRI revealed three gastric mucosal lesions exhibiting hypervascularity, a characteristic feature of ccRCC. Histological analysis confirmed the presence of malignant cells compatible with RCC.