|IMAGES AND VIDEOS
|Ahead of print publication
A pancreatic metastasis from a colon carcinoma mimicking a primary tumor diagnosed by EUS-guided fine-needle biopsy
Stefano Rizza1, Elena Maldi2, Cristiana Laudi1, Alfredo Mellano3, Alberto Pisacane2, Teresa Staiano1
1 Gastroenterology and Digestive Endoscopy Unit, Candiolo Cancer Institute, FPO - IRCCS, Candiolo, Torino, Italy
2 Pathology Unit, Candiolo Cancer Institute, FPO - IRCCS, Candiolo, Torino, Italy
3 Surgical Oncology Department, Candiolo Cancer Institute, FPO - IRCCS, Candiolo, Torino, Italy
|Date of Submission||19-Aug-2021|
|Date of Acceptance||29-Nov-2021|
|Date of Web Publication||21-Mar-2022|
Gastroenterology and Digestive Endoscopy Unit, Candiolo Cancer Institute, FPO - IRCCS, Candiolo, Torino
Source of Support: None, Conflict of Interest: None
|How to cite this URL:|
Rizza S, Maldi E, Laudi C, Mellano A, Pisacane A, Staiano T. A pancreatic metastasis from a colon carcinoma mimicking a primary tumor diagnosed by EUS-guided fine-needle biopsy. Endosc Ultrasound [Epub ahead of print] [cited 2022 Sep 24]. Available from: http://www.eusjournal.com/preprintarticle.asp?id=340253
Pancreatic metastases are rare (2% of pancreatic neoplasms) and only 1.3% originate from colorectal cancer (CRC). As documented, they can appear long after the initial surgery and primary cancer most frequently associated is renal cell carcinoma.,,, A histopathologycal preoperative diagnosis is very challenging.
A 66-year-old male underwent a left hemicolectomy (and then subtotal colectomy for complications) in urgency for an intestinal obstruction of neoplastic origin. Histological examination revealed an ulcerated CRC with a 10% mucinous component (Stage IIIb: pT4aN1M0). Four months later, a computed-tomography (CT) described liver metastases in three liver segments (S) which, after neoadjuvant chemotherapy, were treated with atypical resections.
After 18 months, an 18-fluoro-2-deoxy glucose positron emission tomography/CT (PET/CT) showed uptake in S6 and S8 and in the pancreatic tail. Oncologists decided to perform second-line chemotherapy and a further staging PET-CT revealed a partial response in S8. CT confirmed liver metastasis in S6 and a hypodense lesion of 26 mm of the pancreatic tail, uncertain whether primary or secondary [Figure 1].
|Figure 1: Abdominal computed tomography showing a hypodense lesion of the pancreatic tail, in close proximity to posterior gastric wall|
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Multidisciplinary team indicated EUS-guided fine-needle biopsy (EUS-FNB). EUS showed a lesion of the pancreatic tail measuring 24 mm × 21 mm, hypoechoic and inhomogeneous, with poorly defined margins, hypovascularized even after administration of contrast medium (Sonovue), of hard consistency on elastosonography, close to the splenic vessels and the posterior gastric wall. The main pancreatic duct was regular [Figure 2]. Based on these findings it was difficult to distinguish whether it was primary or secondary. FNB was performed using a 25-G needle (SharkCore®, Beacon Endoscopic/Medtronic, Newton, MA, USA). Sufficient specimens were obtained after 3 passes. The histopathological and immunohistochemical analysis described the presence of adenocarcinoma and revealed cytokeratin-20 (CK20) and caudal-type homeobox transcription factor-2 (CDX2) positive with CK7 negative, morphologically similar to primary colon cancer cells [Figure 3]. Thus, we reached a final diagnosis of metachronous pancreatic metastasis from CRC and the patient will be discussed for subsequent treatment (chemotherapy or surgery).
|Figure 2: EUS showing the lesion of the pancreatic tail appearing hypoechoic and inhomogeneous, with poorly defined margins (a), hypovascularized, hard on elastosonography (b); fine-needle biopsy (NFB) (c)|
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|Figure 3: Histological section (Hematoxylin and Eosin stain) of the pancreatic metastasis (a) and immunohistochemistry showing cytokeratin-20 and caudal-type homeobox transcription factor-2 (CDX2) positive (b and c) with cytokeratin-7 negative (d)|
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EUS-FNB is a fundamental diagnostic tool: it allowed to preoperatively characterize a rare pancreatic lesion, overcoming the limits of imaging alone, so as to discuss the best therapeutic strategy, considering the overall patient's medical history.
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Conflicts of interest
The authors declare no conflict of interest.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given his consent for his images and other clinical information to be reported in the journal. The patient understands that his name and initials will not be published and due efforts will be made to conceal his identity, but anonymity cannot be guaranteed.
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[Figure 1], [Figure 2], [Figure 3]