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Contemporary Oncology/Współczesna Onkologia
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Case report

Multiple metastases of renal clear cell carcinoma to the organs of the head

Piotr Sawicki
,
Wojciech Kaźmierczak
,
Paweł Burduk
,
Henryk Kaźmierczak

Contemp Oncol (Pozn) 2014; 18 (6): 448–451
Online publish date: 2014/12/31
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The incidence of metastasis from distant foci to the ENT organs is rare, but the percentage has increased in recent years along with the growth of the overall incidence of cancer [1–4]. Clear cell renal carcinoma typically metastasises to the lungs, bones, brain, ovary, and prostate. The spread to other organs is casuistic [5, 6]. It constitutes approximately 90% of malignant neoplasm of the kidney, and there is a high incidence of metastases to other organs [7, 8]. In a few documented cases, distant metastases appeared many years after treatment of the primary tumour [9, 10].
Because of its insidious course, clear cell renal carcinoma is often not recognised for a long time. This predisposes to the formation of distant metastases, which are often the first sign of cancer. Distant metastases spread both through the blood and the lymph vessels. The histological structure reveals cells with clear cytoplasm. It contains large amounts of phospholipids and triglycerides. These components are removed from the cells during the treatment of a preparation, which is observed microscopically as an “empty cell” [11].
In the presented case, a renal tumour was detected during diagnostic tests for systemic disease. Metastatic changes were not reported at that time.

Case report

A 63-year-old patient, J.M., was admitted to the Department of Otolaryngology and ENT Oncology at the Medical College in Bydgoszcz of the Nicolaus Copernicus University in October 2012 due to a tumour of the tongue base, located on the right side together with ulceration of the alveolar part of the mandible on the same side.
In 2009, the patient was diagnosed with a kidney tumour while being hospitalised at the Department of Rheumatology of the 10th Military Clinical Hospital in Bydgoszcz. The patient was then transferred to the Department of Urology, where he underwent left-sided nephrectomy. The histopathological examination revealed clear cell carcinoma of the left kidney (G-2, pT2, N0). A tumour 6 × 4 cm in diameter was located slightly above the surface of the kidney; it did not infiltrate the hilus (at a distance of 3–4 cm) or the tumour capsule. The perirenal adipose tissue and the adrenal gland were free from tumour infiltration.
In September 2012, the patient was hospitalised because of dysphagia at the Department of Otolaryngology. During hospitalisation, a biopsy of the tumour located on the tongue base, on the right side, showed no infiltration of the lower jaw. The histological examination demonstrated malignant cancer cells and hypocellular bloody aspirates; the uncertain cytological image may correspond to the metastatic lesion of clear cell renal carcinoma.
Computed tomography revealed a pathological, irregular lesion located at the bottom of the oral cavity, on the right side and medially, ranging from the root of the tongue to the level of the hyoid bone, which was reinforced after contrast administration (size 44 × 64 × 76 mm). It reached the lower jaw in the front part and the hyoid bone in the lower part, without any signs of bone destruction. It connected with the epiglottis in the lower part. It crossed the midline. The submandibular lymph nodes measured 7–8 mm. In the medial part of the left cerebellar hemisphere, just below the fourth ventricle, there was an area of strong enforcement measuring 9 × 13 × 10 mm, a focal lesion, which demanded further diagnosis (Figs. 1–4).
In October 2012, the patient was admitted for further evaluation to the Department of Otolaryngology and ENT Oncology with the Unit of Audiology and Phoniatrics of the Medical College in Bydgoszcz, Nicolaus Copernicus University. Medical history revealed pain of the right half of the head and difficulty in swallowing. Physical examination showed ulceration in the toothless part of the alveolar mandible, on the right side, measuring 1.5 × 3 cm, limited mobility of the tongue, and palpation noticed induration within the base of the tongue, on the right side, covered with a smooth mucous membrane. Examination of the lymphatic system found enlarged and mobile lymph nodes, on both sides, not exceeding 1 cm. Due to the uncertain nature of the lesion revealed in test number 26465, the patient was qualified for biopsy of the specimen taken from the tumour of the tongue base under local anaesthesia.
The result of test No. 6196 was cancerous metastases. The test examined tissue material with a total diameter of 1.5 cm and creamy-brown colour. The results of immunohistochemical tests for the basic lesion were as follows: CD10 (+), Vimentin (+), Ki 67 index about 30%, SMA-positive reaction in the vascular walls, and CK HMW (negative). Microscopic and immunohistochemical tests supported the primary renal location of the tumour. In addition, a specimen was collected for histopathological examination from ulceration within the body of the mandible. The result of test No. 6631 was metastasis of clear cell carcinoma.
Computed tomography (CT) performed during hospitalisation showed an area of strong contrast enhancement covering the base of the tongue, the muscles of the oral bottom, the mental area (destruction of the bone of the lower jaw at this level, 3.5 cm long), pre-epiglottic space to the hyoid bone, the right side of the pharyngeal wall, right submandibular salivary gland, and the area of the right vascular nerve bundle. In addition, it was found that at the border of the left hemisphere of the cerebellum and vermis, there was a focus of the contrast enhancement measuring 15 × 8 × 12 mm – probably a metastatic lesion [further magnetic resonance imaging (MRI) evaluation was recommended]. At the top of the left lung, there was a nodule of size 8 mm [further positron emission tomography/computed tomography (PET/CT) evaluation is recommended] (Figs. 5, 6). The MRI findings revealed a pathological mass covering the tongue and its base; on the right side, it exceeded the midline, had a rough outline, and infiltrated the muscular floor of the mouth. Anteriorly, the mass invaded the lower jaw. Part of it, measuring 26 × 27 × 31 mm, pressed into the interdental space and led to the front of the lower jaw. Posteriorly, the mass covered the entire lumen of the throat adhering to the rear wall, taking up the pre-epiglottic space and infiltrating the right parotid and submandibular gland. In addition, on the border of the left hemisphere of the cerebellum and the vermis, there was a sharply restricted isointense focus enhanced by the contrast, of size 14 × 11 × 14 mm, which was probably metastatic (Figs. 7, 8).
Due to the extensive local progression of metastases within the throat and the mouth, as well as metastatic changes reported in the clinical imaging, the patient was qualified for tracheotomy and cytoreductive surgery of the mandible. Partial resection of the mandibular body was performed, including the tumour. Postoperative complications were not observed. After neurological and psychological consultation, the patient was referred to the Centre of Oncology in Bydgoszcz for further radio-chemotherapeutic treatment.

Discussion

Kidney cancer constitutes between 2 and 3.75% of malignancies in men. In 2.7 to 2.91% of cases it leads to death, and five-year survival is more than 35% of treated patients [12]. Due to the rarity of clear cell renal carcinoma metastases to the head and neck, the literature describes relatively few cases of such location [13–15]. The primary lesion is often asymptomatic for several months. This increases the risk of developing metastases, which may occur even 10 years after operation of the kidney tumour. Despite a good understanding of clear cell carcinoma histology, the image of metastatic lesions may present many diagnostic difficulties due to various shapes of its cells and anisochromia [16]. In our patient, the tumour of the tongue, which caused pain and dysphagia, occurred two years after urological surgery and quickly infiltrated the floor of the mouth. Taking into account the results of imaging studies, it is difficult to specify whether the pathology within the body of the mandible is simply another metastatic focus or infiltration spreading from the soft tissues of the mouth floor. Resection of part of the mandibular body was carried out to improve the quality of life in the patient at this stage of the disease. The focus within the hemisphere and the cerebellar vermis did not produce neurological symptoms, but they were detected during the search for other distant metastases. Because of the extent of metastases in the oral part of the throat, the patient was secured by tracheostomy. Due to the number of distant metastases typical of clear cell renal carcinoma, the patient was referred for radio-chemotherapeutic treatment to improve his quality of life [17, 18].

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Address for correspondence
Piotr Sawicki
, MD PhD
Department of Otholaryngology
Ludwik Rydygier Medical College in Bydgoszcz
M. Curie-Skłodowskiej 9
85-094 Bydgoszcz
e-mail: piotr.sawicki@cm.umk.pl

Submitted: 24.10.2013
Accepted: 27.12.2013
Copyright: © 2014 Termedia Sp. z o. o. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
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