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Tongue metastasis as an initial presentation of renal cell carcinoma: a case report and literature review

Journal of Medical Case Reports20082:249

DOI: 10.1186/1752-1947-2-249

Received: 09 October 2007

Accepted: 25 July 2008

Published: 25 July 2008

Abstract

Introduction

Primary tumour of the kidney metastasizing to the tongue is very unusual and only anecdotal cases have been reported. An exhaustive literature review covering the period from 1911 onwards disclosed 28 cases. Out of those, only 3 cases presented initially with tongue metastases before the diagnosis of primary renal cell carcinoma.

The prognosis for patients with lingual metastasis of renal cell carcinoma is poor. Treatment of tongue metastasis is usually palliative and aims to provide patient comfort by means of pain relief and prevention of bleeding and infection. Surgical excision is recommended as the primary treatment with emphasis on preservation of tongue structure and function.

Case presentation

We report a case of tongue metastasis as an initial presentation of renal cell carcinoma in a 78-year-old man. Initially thought to be primary tongue cancer but on review of his histopathology again, it was diagnosed to be a rare metastasis from kidney cancer.

Conclusion

Tongue metastasis from renal cell carcinoma is rare and its diagnosis is a challenge. The prognosis of patients with tongue metastasis is poor. Similar to the primary tumours of the tongue, metastatic lesions may be ulcerated or polypoid. Since the tongue is a rare metastatic site, when a lesion is detected, a thorough evaluation to distinguish between metastasis and primary cancer should be made as the management and prognosis vary.

Introduction

Metastasis to the tongue seldom occurs, and lingual metastasis as an initial sign of cancer occurs even less frequently.

Metastasis to the head and neck area from a primary site in the abdomen is rare. Renal cell carcinoma (RCC) is the third most common tumour after lung and breast to metastasize to the head and neck region. Less than 15% of patients with renal cell carcinoma actually show metastasis to this area. We discuss a case of renal cell carcinoma presenting with pathologically proven metastasis in the tongue.

Case presentation

A 78-year-old man who was a chronic smoker presented to the maxillofacial department at a district general hospital with a 6-week history of difficulty in swallowing solids together with pain in his pharynx.

On examination, he was noted to have a 3 × 2 cm solitary pedunculated lesion on the right side of the anterior two-thirds of his tongue crossing the midline. His tongue mobility was normal and there was no palpable cervical lymphadenopathy.

Systematic examination of chest, abdomen and heart were normal. The lesion was biopsied and initially reported as a primary squamous cell carcinoma with some clear cell changes. His blood tests including renal functions were normal. His case was discussed in the head and neck cancer multidisciplinary team (MDT) meeting and subtotal glossectomy was planned after a staging MRI (magnetic resonant imaging) scan followed by adjuvant radiotherapy to the head and neck region. While awaiting an MRI, he presented to the hospital with severe pain in his oral cavity and difficulty in swallowing. His tongue lesion had doubled in size in a matter of two weeks and was now protruding outside the mouth (Figure 1). It was considered unusual for primary squamous cell carcinoma of tongue to behave like that. The pathology was therefore reviewed at the same MDT meeting and this time the lesion was reported as partly squamous epithelium covered by fibromuscular tissue showing infiltration by a carcinoma, seen in the nests with extensive clear cell changes. The differential diagnosis was considered to be squamous cell carcinoma with clear cell changes, metastatic salivary gland neoplasm or metastases from RCC. It was decided to arrange an urgent CT scan and to debulk the tongue lesion surgically, to improve his symptoms. The patient had not described any suspicious urinary symptoms.
https://static-content.springer.com/image/art%3A10.1186%2F1752-1947-2-249/MediaObjects/13256_2007_Article_436_Fig1_HTML.jpg
Figure 1

Tongue metastasis.

A CT scan of the neck, chest and abdomen revealed a 4.7-cm sized irregular mass in the left kidney suggestive of RCC (Figure 2). There was no local extension and the left renal vein was clear. A solitary tongue lesion with no neck nodes was reported. No metastases were seen in the lungs, liver, adrenals, spleen and bones.
https://static-content.springer.com/image/art%3A10.1186%2F1752-1947-2-249/MediaObjects/13256_2007_Article_436_Fig2_HTML.jpg
Figure 2

CT scan showing primary tumour of left kidney.

As per the MDT decision, he underwent a debulking surgery of the tongue metastasis, which was performed without complication. His swallowing improved significantly. Postoperatively, he received radiotherapy to his oral cavity delivering a dose of 60 Grays in 30 daily fractions over 6 weeks, which was well tolerated. Radiotherapy was given to treat the microscopic disease in his head and neck region.

A post-radiotherapy CT scan, 18 weeks after initial presentation, was arranged before radical nephrectomy, which unfortunately revealed early evidence of lung metastases. As the patient reported shoulder pain, a plain X-ray and bone scan were carried out and this revealed evidence of a solitary bone metastasis in the right scapula.

Following his debulking surgery and adjuvant radiotherapy, he underwent a radical left-sided nephrectomy. Histopathology confirmed a Fuhrman grade 3 clear cell carcinoma of the left kidney with extension into the superior perirenal fat but not into the renal sinus and with no microvascular infiltration. The maximal dimension of the tumour was 5 cm. The patient has subsequently been treated with interferon-alpha (dose: 3 MU, three times a week) as a systemic treatment for his metastatic disease. A repeat CT scan after six months of treatment showed a complete response with no evidence of any distant metastases.

Discussion

RCC may remain clinically occult for most of its course. The classic presentation of pain, haematuria, and flank mass occurs in a minority of patients and is often indicative of advanced disease. A tumour in the kidney can progress unnoticed to a large size in the retroperitoneum until metastatic disease appears. It can metastasize to any location in the body, and its propensity to metastasize to unusual sites has been well documented. Approximately 30% of patients with renal carcinoma present with metastatic disease, 25% with locally advanced renal carcinoma, and 45% with localized disease [1]. About 75% of patients with metastatic renal carcinoma have metastases to the lung, 36% to soft tissues, 20% to bone, 18% to liver, 8% to cutaneous sites and 8% to the central nervous system [2]. Approximately 15% of renal cell carcinomas metastasize to the head and neck region – specifically, to the paranasal sinuses, larynx, jaws, temporal bones, thyroid gland, and parotid glands [3, 4]. Tongue metastasis is rare.

After an exhaustive literature search, we found 28 cases which had been reported since 1911 (Table 1). Tongue metastasis as an initial presentation of RCC is extremely rare and we found only three cases published in the literature so far, reported in 1987, 1994 and 1996 (Table 2).
Table 1

Previous case reports of renal cell carcinoma metastasizing to tongue

S No

Author.

Year

Age/sex

Site

Other metastases

1

Kostenko

1911

43/M

  

2

Coenen

1914

62/F

  

3

McNattin & Dean

1931

58/M

 

Lung, heart, skin

4

Trinca & Willis

1936

57/M

  

5

Schrag

1945

34/M

 

Lung

6

Del Carmen

1970

77/M

 

None

7

Satomi et al.

1974

41/F

Left surface

Lung

8

Friedlander

1979

84/M

Tip of tongue

Lung

9

Fitzgerald

1982

63/M

Right dorsum

Brain

10

Kitao et al.

1986

37/M

BOT

None

11

Inai

1987

42/M

Left base

Lung

12

Matsumota & Lio

1987

77/F

Left surface

Lung

13

Kapoor

1987

70/M

Not mentioned

Not mentioned

14

Madsion & Fereson

1988

63/M

Right ventral surface

Lung, liver

15

Ishikawa

1991

59/F

 

Lung, bone

16

Okabe et al.

1992

58/M

Left base

Lung, brain

15

Shibyama

1993

41/M

BOT

Lung, bone, lymph nodes

16

Ziyada

1994

59/M

Right base

None

17

Aguirre

1996

82/F

Tip of tongue

Brain

18

Airoldi

1995

51/M

 

Lung

19

Konya

1997

59/M

 

Para-aortic, lymph nodes

20

Tomita

1998

50/M

Left border

Lung, brain, skin

21

Goel

1999

62/M

Left surface

Lung

22

Navarro et al.

2000

62/M

Right lateral

Lung

23

Fukuda

2002

74/M

Left side

 

24

Mariomi et al.

2002

87/F

Dorsum

Lung, liver, thyroid, pancreas

25

Emer et al.

2003

45/M

Tip of tongue

Nose, lungs

26

Kyan & Kato

2004

66/M

Base of tongue

Lungs

27

Torres-Carranza

2006

49/F

Middle third of dorsum

Lungs

28

Huang & Chang

2006

76/F

BOT

Lungs, liver

29

Present case

2007

68/M

Anterior right lateral

Lungs, bone

BOT, base of tongue.

Table 2

Tongue metastasis as the initial presentation of renal cell carcinoma

S No

Authors

Year

Age/sex

Site

Other metastases

1

Kapoor et al. [10]

1987

70/M

Not mentioned

Not mentioned

2

Ziyada et al. [11]

1994

59/M

Right BOT

None

3

Aguirre and Rinaggio [12]

1996

82/F

Tip of tongue

Brain

5

Present case

2007

68/M

Anterior right lateral

Lungs, bone

BOT, base of tongue.

Possible routes of metastatic spread to the tongue are the arterial, venous and lymphatic circulation. Metastases are mostly located on the base of the tongue possibly due to its rich vascular supply, through the dorsal lingual artery, and due to immobility as compared to other parts of the tongue. RCC invades the local vascular network of the kidney and spreads through the systemic circulation. Head and neck metastasis is commonly associated with lung metastases. If there are no signs of pulmonary disease, as in our case initially, it is possible that spread has been via Batson's venous plexus or via the thoracic duct. Batson's venous plexus extends from the skull to the sacrum. This valveless system theoretically offers less resistance to the spread of tumour emboli, especially when there is an increase in intrathoracic and intra-abdominal pressure, allowing retrograde flow by-passing pulmonary filters [5].

Nephrectomy may be justified in patients with metastatic disease to improve quality of life or local symptoms and to confer a possible survival advantage [6]. However, it is not justified when the intention is to induce spontaneous tumour regression which occurs in less than 1% of cases.

Management of tongue metastasis is surgical excision and this was followed in our patient by adjuvant radiotherapy to achieve local control of disease. Chemotherapeutic agents including fluoropyrimidines together with biological agents such as interferon-α can offer a palliative benefit in some patients with RCC. Shibayama et al. reported a complete response in a base of the tongue metastasis after interferon-α therapy [7]. Newer agents such as sorafenib and sunitinib have been shown to improve progression-free survival in metastatic RCC [8, 9]. Temsirolimus and bevacizumab have also shown promise in early phase trials.

A thorough evaluation to distinguish between primary and secondary tongue cancer is essential. Primary cancer of the tongue is treated with curative intent and this includes total glossectomy with or without neck node dissection followed by radical radiotherapy in the early stages and concomitant chemotherapy (cisplatinum and 5 fluorouracil) and radiotherapy in the later stages.

Secondary tumours of the tongue are managed with palliative intent, which includes surgery, radiotherapy and immunotherapy. The prognosis of metastatic RCC is poor and 5-year survival is less than 10%.

Conclusion

Twenty-eight case reports of tongue metastasis from kidney cancer since 1911 have been documented (Table 1) and its occurrence as a presentation of kidney cancer was found to be extremely rare with only three cases reported in the last century (Table 2) before the current case.

Metastatic spread to the tongue may occur in advanced stages of RCC. The prognosis of patients with tongue metastasis is poor because most of them have widespread disease. Similar to primary tumours of the tongue, metastatic lesions may be ulcerated or polypoid. Clinical and even histological differentiation between the two conditions can be challenging. Since the tongue is a rare metastatic site, when a lesion is detected, a thorough evaluation should be made to distinguish between metastasis and primary cancer, so that appropriate treatment can be offered.

Consent

Written and informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.

Abbreviations

RCC: 

Renal cell carcinoma

MRI: 

Magnetic resonance imaging

CT: 

Computed tomography

MDT: 

Multidisciplinary team.

Declarations

Authors’ Affiliations

(1)
Department of Oncology, North Wales Cancer Treatment Centre, Glan Clwyd Hospital

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Copyright

© Azam et al; licensee BioMed Central Ltd. 2008

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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