|Year : 2016 | Volume
| Issue : 6 | Page : 540-543
Primary small cell carcinoma of kidney in a young female: A rare case report
Ajay Kumar Pal, Sudheer Rathi, Krishna Murty, Nishant Misra
Department of Surgery, LLRM Medical College, Meerut, Uttar Pradesh, India
|Date of Web Publication||14-Feb-2017|
Ajay Kumar Pal
Department of Surgery, King George Medical University, Lucknow - 226 003, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
Small cell carcinomas (SCCs) occur mainly in pulmonary tract while extrapulmonary SCCs (EPSCCs) are rare neoplasms comprising approximately 2.5% of all SCCs. A 23-year-old female presented with complaints of hematuria and a mass in right flank region. She had no other complaints. Examination of the patient revealed lump in the right lumbar region with no other remarkable findings. Contrast-enhanced computed tomography showed a large heterogeneously enhancing necrotic mass involving the right entire kidney. A right radical nephrectomy was performed, and a histological examination revealed mass involving whole right kidney with capsular and lymphatic invasion along with small cell histology. The patient was given adjuvant chemotherapy of etoposide and carboplatin, every 3 weeks. The patient started complaining of bony pain after 1 month of operation, and bone scanning revealed of multiple osteoblastic lesions. Zoledronic acid (4 mg) had been started for bony metastasis. SCC of the kidney is a rare neoplasm of the elderly age group that has aggressive behavior with an increased tendency for locoregional and distant dissemination. Our patient represents the first case of SCC of the kidney to be reported in a young female.
Keywords: Chemotherapy, female, metastasis, nephrectomy, small cell carcinoma
|How to cite this article:|
Pal AK, Rathi S, Murty K, Misra N. Primary small cell carcinoma of kidney in a young female: A rare case report. Clin Cancer Investig J 2016;5:540-3
|How to cite this URL:|
Pal AK, Rathi S, Murty K, Misra N. Primary small cell carcinoma of kidney in a young female: A rare case report. Clin Cancer Investig J [serial online] 2016 [cited 2017 May 26];5:540-3. Available from: http://www.ccij-online.org/text.asp?2016/5/6/540/200109
| Introduction|| |
Small cell carcinomas (SCCs) occur mainly in pulmonary tract while lung extrapulmonary SCCs (EPSCCs) are rare neoplasms comprising approximately 2.5% of all SCCs. Among EPSCCs, urinary bladder prostate and are most notable sites in genitourinary tract. Kidney as a Primary site of SCC is exceedingly rare with approximately fifty cases published till date , and most of these cases patient were above 60 years of age (median age = 62 years). Since it is infrequent, the natural course of renal SCC is not recognized very well. The clinical course of this disease is highly aggressive and frequently associated with recurrence. Surgical resection may not suffice, and adjuvant chemotherapy forms an important pillar of therapy. We, therefore, present a case report of this rare malignancy in a young female along with management challenges faced by us.
| Case Report|| |
We report a case of 23-year-old female who presented with complaints of hematuria and a mass in the right flank region. She had no other complaints and gave a normal past, menstrual, family, and medical history. Examination of the patient revealed lump in right lumbar region with no other remarkable findings.
Contrast-enhanced computed tomography [Figure 1] and [Figure 2] abdomen was performed and it showed a large heterogeneously enhancing necrotic mass of 14 cm × 9 cm involving the right entire kidney with minimal sparing of the right upper pole with distortion of the pelvicalyceal system and thinning of renal parenchyma and extension into renal pelvis with intra-tumoral thrombus in right renal vein extending up to its confluence with inferior vena cava with no contrast excretion. Other radiological investigation (chest X-ray, pelvis, and spine) were normal.
|Figure 1: Arrow showing large heterogeneously enhancing necrotic mass of involving the right entire kidney|
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|Figure 2: Three-dimensional reconstruction image. Arrow showing 14 cm × 9 cm mass involving the right entire kidney with minimal sparing of the right upper pole with distortion of the pelvicalyceal system and thinning of renal parenchyma and extension into renal pelvis|
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A right radical nephrectomy was performed, and a histological examination revealed 15 cm × 10 cm × 10 cm mass involving whole right kidney with capsular and lymphatic invasion along with small cell histology with no lymphatic involvement. Neuroendocrine differentiation was proven by a positive immunoreaction to synaptophysin and neuron-specific enolase [Figure 3],[Figure 4],[Figure 5].
|Figure 4: Histopathological examination showing tumor and adjacent normal renal parenchyma|
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|Figure 5: Histopathological examination showing small round cells distributed in a nested pattern|
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| Discussion|| |
SCC is a highly malignant and aggressive tumor with usual site in lung. EPSCC is a relatively rare and was first reported in 1930 by Duguid and Kennedy. SCCs are uncommon in the urinary tract and mostly they are associated with other components such as transitional cell carcinoma, adenocarcinoma, squamous cell carcinoma, and sarcomatoid squamous cell carcinoma. Most commonly urinary bladder is the site of urinary tract SCC, with the primary renal pelvis, renal parenchyma, and ureteral SCC occurrence is distinctively rare. In 1998, Mackey et al. reported 180 cases of urinary tract SCC out of which 106 cases were located in the urinary bladder, sixty in the prostate, eight in the kidney and six in the ureter. In a study by Majhail et al. (2003) of 22 patients of SCC of kidney and renal pelvis, 62 years was the median age with a female preponderance (male:female ratio, 1:3.4). Among symptoms, abdominal pain (70%) was most commonly reported. Thirty-two percent had distant metastases at the time of diagnosis. Therapy was constituted by surgery and/or systemic chemotherapy (nephrectomy alone: Nine patients; nephrectomy and chemotherapy: Ten patients; chemotherapy alone: Three patients) with median survival being 8 months (range, - 1–101 months). Improved overall survival was present with the use of platinum-based chemotherapy (median survival was 20 months in patients receiving a platinum-containing regimen compared with 8 months in those who did not receive platinum; P = 0.02).
Regarding histopathogenesis of urinary tract SCC, two theories have been put forward. One suggests that it originates from intrinsic neuroendocrine cells within the normal genitourinary tract, derived from the neural crest  during embryogenesis, whereas the other indicate that it transforms from pluripotent epithelial reserve  cells in the genitourinary tract with the ability to generate any cell type. Transitional cell carcinoma or other histology exists as frequent combinations with SCC and thus lending support to the latter theory. Urinary tract SCC shares the same histologic features of lung SCC, which are round to fusiform shaped small cells, inconspicuous or absent nucleoli, scanty cytoplasm, and high mitotic activity. Tumor cells have positivity for neuroendocrine markers such as chromogranin, synaptophysin, and neuron-specific enolase. The clinical features of primary urinary tract SCC are indistinguishable from those of renal clear cell carcinoma, with hematuria and flank pain being the most frequently reported symptoms. Gross hematuria is due to vascular invasion, while pain is secondary to hydronephrosis following obstruction of the ureter. These symptoms are hallmark of an advanced stage.
The staging of urinary tract SCC is in accordance with SCC of the lung, that is, whether or not the primary tumor can be encompassed within a tolerable radiation therapy port. Thus, a tumor confined to the primary site, with or without regional lymph node involvement, is classified as limited disease, whereas spread of the disease beyond locoregional boundaries is considered an extensive disease.
In our case, it was limited disease at the time of surgery.
What constitutes optimal treatment of urinary tract SCC is not well-established. Multimodality therapy being advocated by many includes surgery, chemotherapy, and radiation., The presently recommended combination of a platinum-based chemotherapeutic agent and etoposide is the most commonly used regimen because of its better response rate compared with other regimens.
The patient was given adjuvant chemotherapy. Four cycles of adjuvant combination chemotherapy were scheduled, including etoposide 80 mg/m 2 on days 1, 2, and 3 with carboplatin 80 mg/m 2 on day 1, every 3 weeks.
The patient started complaining of bony pain after 1 month of operation and bone scanning revealed of multiple osteoblastic lesions in the region of left parietal region in skull, right head of humerous, sternum, multiple cervical vertebra, left side multiple ribs and left head of femur and acetabulum.
| Conclusion|| |
SCC of the kidney is a rare neoplasm of the elderly age group that bears the features of its equivalent arising from the tracheobronchial and other extrapulmonary sites in its aggressive behavior with an increased tendency for locoregional and distant dissemination. Clinical presentation is usually delayed with high likelihood of occult/disseminated metastasis. Our patient represents the first case of SCC of the kidney to be reported in a young female. Limited improvement in survival offered by platinum-based chemotherapy in these cancers should be explored with further research.
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Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]