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Choriocarcinoma of the kidney
R B Mack1, S M Katz, P S Amenta
1Department of Pathology, Hahnemann University, Philadelphia, Pa.
Abstract:
Choriocarcinoma is a malignant germ cell tumor that usually arises from a previous gestation, but may also arise from germ cells anywhere along their known migratory pathway during fetal development. Gestational choriocarcinoma is highly sensitive to chemotherapy. This malignancy is known to undergo spontaneous regression of the primary tumor, which, in the face of metastases, may obscure the primary tumor site. The authors report the case of a patient with choriocarcinoma who was seen with pulmonary metastases and a single large lesion in the kidney 5 years posthysterectomy. The problems in resolving the primary site and the importance of a tissue diagnosis before nephrectomy are discussed.
Insights
Choriocarcinoma, a rare germ cell tumor, can metastasize and regress spontaneously, complicating diagnosis. This case highlights the diagnostic challenges of identifying the primary site years after initial treatment.
Area of Science:
- Oncology
- Pathology
- Reproductive Medicine
Background:
- Choriocarcinoma is a malignant germ cell tumor with high sensitivity to chemotherapy.
- It can arise from gestation or ectopic germ cells, often undergoing spontaneous regression.
- Metastases can obscure the primary tumor, posing diagnostic challenges.
Observation:
- A patient presented with pulmonary metastases and a renal lesion 5 years post-hysterectomy.
- The primary choriocarcinoma site was initially unclear due to tumor regression.
- The case involved a rare presentation of choriocarcinoma with a delayed renal manifestation.
Findings:
- Gestational choriocarcinoma is highly responsive to chemotherapy and can exhibit spontaneous regression.
- Metastatic disease can present long after initial treatment, with the primary site obscured.
- A solitary renal lesion can represent a metastatic focus of choriocarcinoma.
Implications:
- Accurate tissue diagnosis is crucial before invasive procedures like nephrectomy.
- Delayed presentations of choriocarcinoma require thorough investigation to locate the primary tumor.
- Understanding spontaneous regression is key to diagnosing and managing choriocarcinoma effectively.