Intrahepatic cholangiocarcinoma with gastric infiltration misdiagnosed as gastric submucosal tumor

Abstract

Intrahepatic cholangiocarcinomas (ICC) are rare primary liver tumors. In few cases, they may invade nearby organs and present as extrahepatic growths, leading to poor prognosis. We report a case of a 78-year-old man who presented with fatigue. An upper gastrointestinal endoscopy was performed to find a cause for his anemia, which showed a submucosal tumor with delle at the lesser curvature of the gastric cardia. A computed tomography revealed a low-density tumor of diameter 70 mm at the cardia. It appeared to infiltrate the liver directly. We performed lateral hepatectomy, proximal gastrectomy and lymphadenectomy. The pathological findings revealed an ICC with gastric infiltration. Although adjuvant chemotherapy was administered, 12 months postoperatively, the patient developed pain and multiple bone metastases for which palliative radiation was initiated. The guidelines for lymphadenectomy and adjuvant chemotherapy in such cases are unclear. Appropriate regional lymphadenectomy and adjuvant chemotherapy can improve the prognosis of such patients.

INTRODUCTION

Intrahepatic cholangiocarcinoma (ICC) is a rare primary liver tumor, and accounts for 4.8% of all primary liver cancers in Japan [1]. Occasionally, an ICC presents as an extrahepatic growth. In few cases, ICC may invade nearby organs. Herein, we present a case of ICC with gastric infiltration that appeared like a submucosal tumor (SMT).

CASE REPORT

A 78-year-old man visited a hospital for fatigue. He underwent an upper gastrointestinal (GI) endoscopy for anemia, and was diagnosed with a gastric SMT. He was referred to our hospital for further treatment. His family history was unremarkable. His past history included atrial fibrillation, right cerebral infarction and hypertension. His physical examination was unremarkable.

On investigating, his hemoglobin was 10 g/dl, and tumor markers, carcinoembryonic antigen and carbohydrate antigen 19-9 (CA 19-9), were elevated to 12.5 ng/ml and 94.3 U/ml, respectively. Tests for Hepatitis B and C viruses were negative. His upper GI endoscopy showed SMT with delle at the lesser curvature of the cardia (Fig. 1). A computed tomography (CT) showed a slightly low-density tumor of 70 mm in diameter at the cardia (Fig. 2). It appeared to infiltrate into the liver directly. We diagnosed it as gastric SMT (suspected GI stromal tumor) with liver infiltration.

The patient was taken up for surgery. Intraoperatively, the tumor was located in the stomach wall at the cardia and was invading the liver directly (Fig. 3). We performed a lateral hepatectomy by the Glissonean pedicle ligation method, proximal gastrectomy and lymphadenectomy. The operation time was 3 h and 19 min, and intraoperative blood loss was 260 ml. The resected specimen showed a white solid tumor of dimensions 80 mm × 55 mm × 44 mm. It showed a little ulcerative change in the mucosal layer (Fig. 4). Most of the tumor originating from the liver was found under the gastric mucosa (Figs 4 and 5). Microscopically, a poorly differentiated adenocarcinoma with unclear duct formation was detected (Fig. 6). The non-tumor area of the liver was normal. Immunostaining showed that the tumor was positive for AE1/AE3 and negative for CK20, CK7, CD34, c-kit, CD56, synaptophysin and chromogranin A (Fig. 6). Based on these findings, our diagnosis was ICC with gastric infiltration, and we categorized it as pT4, pN0, cM0, Stage IIIB as per the eighth edition of the American Joint Committee on Cancer (AJCC)/Union for International Cancer Control (UICC) [2]. The immediate postoperative course was uneventful, and the patient was discharged on postoperative Day 16. Three months after the surgery, he was administered S-1 orally as adjuvant chemotherapy. However, 12 months after the surgery, multiple bone metastases were detected on CT. He underwent palliative radiation to relieve pain and prevent pathological fractures.

DISCUSSION

ICC has a poor prognosis and an overall 5-year survival of <10% for all patients [3]. Unfortunately, 80–85% of patients with ICC present at an unresectable stage of the disease, with no potential for cure [4]. Kang et al. [5] indicated in a multivariate analysis that independent risk factors for tumor recurrence and patient survival were multiple tumors; CA, 19-9 > 200 U/mL; tumor size, > 5 cm; direct invasion to extrahepatic structures; and lymph node metastases. Although a surgery, such as hepatectomy, is considered the first option of treatment for ICC, the role of lymph node excision is still unclear, with no clear guidelines [6]. Giorgio et al. [6] report that routine regional lymphadenectomy is the most recent therapeutic strategy for ICC because the incidence of lymph node metastases is 40% for ICC. Nozaki et al. [7] suggested that regional lymphadenectomy should be performed in consideration with tumor location and the two main lymphatic drainage routes: one through the hepatoduodenal ligament and other through the cardiac portion of the stomach. If the tumor is located in the right lobe, lymphadenectomy in the former route may be necessary, and if it is located in the left lobe such as in our case, lymphadenectomy in both routes may be necessary. However, since our case was misdiagnosed as gastric SMT, we performed lymphadenectomy only in one route. Bartsch et al. [8] studied 102 cases of hepatectomy for ICC in a single center. Out of these 102, six had visceral infiltration—two in the diaphragm, one in adrenal gland, one in pericardium, one in duodenum and one in colon. They also reported that patients with visceral infiltration had a significantly shorter overall survival than patients without it (14.9 vs. 23.1 months) [8].

In the eighth edition of the AJCC/UICC, T4 is defined as ‘tumor involving local extrahepatic structures by direct invasion’ [2]. To the best of our knowledge, resected ICCs with visceral infiltration have been reported only in three cases in English literature and in 14 cases in Japanese literature (Table 1). The median age of these patients was 63.5 years (range: 41–85). The median size of the tumor was 7.9 cm (range: 3.3–12), and except for one case, the size of the tumor was larger than 5 cm (94%). In six cases, CA 19-9 was over 200 U/L. In eight cases, adjuvant chemotherapy was administered—four, used gemcitabine; one, gemcitabine and cisplatin; one, tegafur; one, tegaful-urasil; and one, S-1. Visceral infiltration was noted for seven in the diaphragm; five, stomach; three, duodenum; three, transverse colon; three, gallbladder; three, lung; two, right adrenal gland; one, right kidney; and one, pancreas (some patients had visceral infiltration in more than one organ). Among the five cases of stomach infiltration, two showed SMT with delle on upper GI endoscopy. Lymphadenectomy was performed in 11 cases (61%). Within 6 months after surgery, three patients died from recurrence.

Like for lymph node excision, no clear guidelines exist for administration of adjuvant chemotherapy for such cases. However, adjuvant chemotherapy with Capecitabine can improve the overall survival in patients with resected biliary tract cancer [3].

Only a few cases of resected ICCs with visceral infiltration have been reported in the literature. Therefore, we believe, our case report can help to understand the characteristic features of these rare cases and, as a result, improve their prognosis.

CONFLICTS OF INTEREST STATEMENT

None declared.

References