Synchronous thyroid and colon metastases from epidermoid carcinoma of the lung: case report

ABSTRACT CONTEXT: Non-small cell lung cancer (NSCLC) progresses to distant metastases in most cases. The most frequent sites for distant metastases are the bones, central nervous system, adrenal glands and liver. Dissemination to the skin, myocardium, thyroid gland and intestine may occur, but is rare. CASE REPORT: We describe a case of squamous cell carcinoma in the lungs, with metastases in the colon and thyroid, in a 66-year-old female patient. The lesion was unresectable and chemotherapy was started. The patient evolved with intestinal subocclusion, and colonoscopy showed the presence of a polyp. Biopsy and immunohistochemical analysis on the polyp showed that it was compatible with squamous cell carcinoma of pulmonary origin. At a follow-up consultation, the patient presented a thyroid nodule. A aspiration biopsy and cellblock immunohistochemistry confirmed the squamous cell carcinoma of pulmonary origin. After third-line chemotherapy, the patient progressed with acute obstructive abdomen due to a retroperitoneal mass. She underwent exploratory laparotomy and died due to surgical complications. Metastases to the thyroid and colon are rarely reported in cases of epidermoid carcinoma of the lungs. Gastrointestinal involvement in pulmonary metastases may affect the stomach, small intestine and colon, and cases of bleeding and perforation have already been reported. Although richly vascularized, the thyroid is an infrequent site for metastases. Such sites reflect poor prognoses for the clinical evolution. We did not find any previous reports in the literature, on lung cancer with metastases concomitantly in the colon and thyroid, in a single patient.


INTRODUCTION
Metastatic non-small cell lung cancer (NSCLC) has a very poor prognosis.Distant metastases have most commonly been diagnosed in the brain (47%), bones (36%), liver (22%), adrenal glands (15%) and lungs (11%).Metastases in the myocardium, skin, thyroid gland and intestine may occur, but are uncommon. 1We report a case with synchronous thyroid and bowel metastases from squamous cell carcinoma of the lungs.

CASE REPORT
An asymptomatic 66-year-old female was diagnosed with a mass in the lower lobe of the right lung from a screening X-ray.She had a history of non-Hodgkin's lymphoma (NHL) in 1984, which had been treated with radiotherapy and chemotherapy, and she had been undergoing follow-up since 1990.Moreover, she had chronic obstructive pulmonary disease relating to tobacco smoking for many years, and congestive heart failure.Computed tomography confirmed the lesion, tomy and right hemicolectomy.She died from septic postoperative complications.No necropsy was performed.

DISCUSSION
Lung cancer is frequently metastatic at the time of diagnosis.The signs and symptoms presented are often caused by the metastasis.Thyroid gland and gastrointestinal tract metastases are reported in 4% and 12% of squamous cell carcinoma cases, respectively. 2ung cancer manifesting as gastrointestinal tract metastasis is exceedingly rare in clinical practice.It is a diagnostic challenge and a sign of late-stage disease.Few cases of bowel metastases from lung carcinoma have previously been reported. 3Cases of small bowel perforation, 4 intussusception 5 and bleeding 6 have already been described.The largest series of lung carcinomas initially presenting with gastrointestinal involvement that has been described consisted of eighteen cases. 7he small bowel was the most common gastrointestinal site involved (12 cases), followed by the stomach (four cases) and large intestine (two cases).Immunostaining with TTF-1, CDX2, CK7 and CK20 has been found to be helpful in highlighting occurrences of primary lung adenocarcinoma.Lung cancer presenting as gastrointestinal tract metastasis is associated with dismal outcomes, and pulmonary resection coupled with chemotherapy might provide a therapeutic option for selected patients with a solitary gastrointestinal tract metastasis. 7owever, our patient underwent emergency colectomy with palliative intent.and a transbronchial biopsy showed the presence of poorly differentiated squamous cell carcinoma.
The tumor had invaded the parietal pericardium, and the hilar nodes had become enlarged; thus, it was staged as IIIA.Pneumonectomy was contraindicated because of the patient's surgical risk, and combined treatment could not be performed because of the extent of the predicted radiotherapy field.At this time, the patient had already noted thyroid enlargement, and the head and neck surgeon's impression was that she presented multinodular goiter.Fine-needle aspiration biopsy was not performed, because she was going to begin oncological treatment.
Induction carboplatin and paclitaxel were administered.After the second cycle, the patient presented symptoms of bowel subocclusion, subsequently followed by diarrhea.Colonoscopy showed the presence of an incidental cecal polyp, and biopsy on this polyp revealed that it was an undifferentiated malignant neoplasm.Immunohistochemical analysis showed that the polyp was AE1/AE3 (+), cytokeratin 20 (-), 34BE12 (+) and TTF-1(-), i.e. compatible with metastasis from squamous cell carcinoma of the lungs (Figure 1).Treatment with vinorelbine was started.After the eighth cycle, the thyroid nodule enlarged even further (Figure 2), and therefore an aspiration biopsy was performed, which detected metastases from squamous cell carcinoma.Treatment with gemcitabine was started.After the first two cycles, she developed a bowel obstruction (Figure 3).Exploratory laparotomy detected a retroperitoneal mass that was causing ileal obstruction, proximally to the ileocecal valve.The patient therefore underwent enterec-

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Cancer metastasis to the thyroid is uncommon.Although the thyroid is richly supplied with blood, there are few reports of metastatic cancer spreading to this gland.The overall incidence in autopsy series has been quite varied, with malignant tumor rates ranging from 1.2 to 24%. 8 The most common site of origin is the kidneys.A neck mass is usually the initial presentation.The diagnosis may be made by means of fine-needle aspiration biopsy with cytological analysis, or even by means of surgery.Radiotherapy may result in disease stabilization.The majority of such patients have been found to present widespread metastases and, as a result, had very short survival times. 9Although detection of metastases in the thyroid gland often indicates poor prognosis, aggressive surgical and medical treatment may be effective, especially if the metastasis is an isolated occurrence.Chemotherapy is a therapeutic option for treating disseminated disease, as used in the case of our patient, with palliative intent. 8istant recurrences are more frequent in patients with nonsquamous lung cancer, whereas squamous cell carcinoma usually presents locoregional dissemination.This pattern of metastasis, which occurred in our patient, was unrelated to previous radiotherapy, since there was no field overlap with the NHL treatment and the primary lesion of the lung.Previous chemotherapy exposure usually does not alter the pattern of dissemination of solid tumors.In the present case, moreover, the time that had elapsed since the last treatment was as long as 20 years.(Lung cancer) AND (Thyroid gland) AND (Metastasis) 325 articles Among these articles, we identified five case reports on thyroid metastasis from lung cancer: two adenocarcinomas, one squamous, one bronchioloalveolar carcinoma and one small-cell carcinoma.There were also four retrospective analyses on metastasis in the thyroid gland, that included 18 cases originating from lung cancer.
(Lung cancer) AND (Intestinal tract) AND (Metastasis) 288 articles 38 articles were selected.The majority of them related to small bowel involvement, with bleeding, obstruction or perforation.There were four reports on gastric involvement and five on the colon.There are few data on isolated thyroid gland or bowel metastases from lung cancer (Table 1).Rarer still is the presentation of lung carcinoma with metastatic lesions in the bowel and thyroid gland at the same time.Our patient is the first reported case with concomitant pathological and clinical findings of these occurrences.

Figure 2 .
Figure 2. Computed tomography of thyroid mass.Figure 3. Abdominal X-ray.A and B: small bowel distention.

Figure 3 .
Figure 2. Computed tomography of thyroid mass.Figure 3. Abdominal X-ray.A and B: small bowel distention.

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Lung cancer) AND (Intestinal tract) AND (Thyroid) AND (Metastasis) 13 articles None of them demonstrated atypical metastasis from lung cancer.Last search for data in Lilacs and Cochrane Library was on April 29, 2010.Last search for data in PubMed was between April 29 and May 1, 2010.

Table 1 .
Search strategies performed and results from each database