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Pancreatic Serous Cystadenoma
Introduction
Pancreatic serous cystadenomas are mostly benign and considered among the common primary pancreatic cystic neoplasms (PCNs), representing one-third (see Image. Serous Cystadenoma, CT).[1] Patients are usually asymptomatic. Other types of PCNs include mucinous cystic neoplasm, intraductal papillary Mucinous neoplasm, cystic neuroendocrine neoplasm, solid-pseudopapillary neoplasm, acinar-cell cystic neoplasm, and ductal adenocarcinoma with cystic degeneration.[2] Due to the increased use and advances in cross-sectional imaging of the abdomen, the detection of these lesions has improved, especially in asymptomatic patients. This topic discusses the pathophysiology, clinical presentation, diagnosis, and treatment of pancreatic serous cystadenoma.
Etiology
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Etiology
The exact etiology of serous cystadenomas is not well understood. Genetic mutations may contribute to serous cystadenoma formation.[3]
Epidemiology
Pancreatic serous cystadenomas represent one-third of PCNs. Pancreatic serous cystadenomas are almost always benign and occur more commonly in women.[4][5][2] Patients usually present between the 5th and 7th decade of life (mean age 62 years), and the lesions occur more frequently in the body or the tail of the pancreas.[6] Around 77% of patients with von Hippel–Lindau (VHL) syndrome develop pancreatic cystic lesions, 9% of which are serous cystadenomas.[7]
Pathophysiology
The pathophysiology of pancreatic serous cystadenomas is poorly understood (see Image. Cystadenoma, 4x H/E). The morphologic and immunohistochemical features of the serous neoplasms favor the centroacinar, intralobular, and ductular cells of the pancreas. The WHO classified them into serous microcystic adenomas and serous macrocystic (oligocystic) adenomas.[7] There are macroscopic variants of serous cystadenoma: microcystic serous cystadenoma (most commonly encountered), macrocytic serous cystadenoma (also referred to as oligocystic), solid serous adenoma, VHL-associated serous cystadenomas, and mixed serous-neuroendocrine neoplasm.[8] Macrocystic serous cystadenomas include both previous serous oligocystic and the ill-demarcated serous adenoma. Solid serous adenomas are well-circumscribed and have a solid gross appearance; they have the cytologic and immunohistologic features of classic serous cystadenomas. Serous cystadenomas that occur in VHL syndrome involve the entire pancreas or in a patchy fashion. The mixed serous neuroendocrine neoplasm is a rare serous cystadenoma associated with pancreatic neuroendocrine tumors. This is also suggestive of VHL syndrome.[8]
Histopathology
Pancreatic serous neoplasms are unifocal, round, well-demarcated, and are often honeycombed. The cysts are loculated, contain mucin-free serous fluid, and are lined by flattened or cuboidal epithelium. Their size can reach to more than 20 cm. They do not communicate with the pancreatic duct. Usually, a dense fibronodular scar is found in the center of the lesion (also called fibrous stellate scar) that is composed of acellular hyalinized tissue and a few clusters of tiny cysts, which are lined by a single layer of cuboidal epithelial cells.[8]
History and Physical
Many patients present without any specific signs or symptoms.[9][10] Often, pancreatic serous cystadenomas are detected incidentally by abdominal ultrasonography or cross-sectional imaging studies performed for another condition. When patients are symptomatic, the most common presentation includes abdominal pain or a palpable mass in the upper abdomen. Less commonly, patients with advanced cystic lesions present similar to those with pancreatic ductal carcinoma, with abdominal pain, weight loss, early satiety secondary to compression of the stomach wall by the adjacent pancreatic mass (gastric outlet obstruction), obstructive jaundice due to obstruction of the biliary tree (may lead to acute cholangitis) and pancreatic duct obstruction causing pancreatic exocrine insufficiency and recurrent pancreatitis.[9][10] True cystic lesions may be confused with pseudocysts, which leads to similarities in the presentations and the characteristics of imaging studies.[11] Pseudocysts usually occur after an episode of acute pancreatitis or insidiously in cases of chronic pancreatitis, and they are frequently associated with pain. Large pseudocysts can compress the stomach, duodenum, or bile duct, resulting in vomiting, early satiety, or obstructive jaundice.
Evaluation
Evaluation of PCNs involves laboratory and imaging modalities to distinguish these types based on morphological and radiological patterns. In the last 15 years, there has been a 20-fold increase in the detection of PCNs, mainly by cross-sectional imaging such as computed tomography (CT) and magnetic resonance imaging (MRI).[12] The advent of imaging modalities led to the detection of 4 morphological serous cystadenoma patterns: microcystic, macrocystic, mixed microcystic, and macrocystic and solid.[13] The microcystic pattern was defined as multiple cysts that measure less than 2 cm and are separated by thin fibrous septa, giving a honeycomb appearance.[14] Macrocystic type is diagnosed when cysts ≥2 cm are seen.[15] Mixed microcystic and macrocystic types combine both microcystic and macrocystic patterns. Solid serous cystic neoplasm vs. serous adenoma is a tumor without any cystic lesions on cross-sectional imaging.
Ultrasound: serous microcystic adenoma usually presents as a well-circumscribed, loculated lesion. The fibrous portion of the lesion is hyperechoic, and the cystic portions appear hypoechoic. In lesions where the cysts are only a couple of millimeters in size (microcysts), the tumor appears solid due to the innumerable interfaces. Areas of calcification also appear hyperechoic with posterior acoustic shadowing.
CT scan: serous microcystic adenomas most commonly have a lobular shape.[16][17][18][19] They appear hypodense on unenhanced CT because the tumor is primarily of water density. Calcifications in up to 30% of serous cystadenomas are pathognomic, and a "sunburst" pattern can be seen less commonly. The central fibrous scar is hyperdense and is generally arranged in a stellate pattern known as a "stellate central scar." After the administration of iodinated contrast material, the fibrous portions are enhanced. Because serous microcystic adenomas are considered the only hypervascular cystic pancreatic tumors, their enhancement pattern is an important distinguishing feature. Lesions with fewer fibrous septations show fluid density regardless of contrast administration. Lesions composed primarily of microscopic cysts can have a solid appearance and show homogeneous enhancement after contrast administration.[19] In these cases, as well as all other cystic pancreatic neoplasms, MR imaging is used to characterize the lesion further. On CT, it is often difficult to differentiate the oligocystic pattern from the mucinous neoplasms. Therefore, serous oligocystic adenomas should be suspected when an unilocular cystic lesion with a lobulated contour without wall enhancement is situated in the pancreatic head. Due to cystic degeneration, macrocystic variants may be confused when imaging with pseudocysts or mucinous cysts.[20]
MRI on T1-weighted fat-suppressed imaging shows that the cystic portions are classically hypointense, but areas of hyperintensity may appear if there has been an intracystic hemorrhage.[21] The fibrous components are hypointense on T1-weighted imaging. On T2-weighted images, the cystic fluid-filled components are hyperintense relative to adjacent pancreatic parenchyma, and the fibrous components are hypointense on T2. In addition, any areas of calcification are hypointense on both T1-weighted and T2-weighted imaging, if visible at all. After gadolinium infusion, enhancement of the fibrous septations is visible in the early and late phases of imaging, and it maintains this enhancement of the central scar in more delayed phases of imaging. MR imaging is more sensitive in detecting fluid than CT imaging, especially in the case of microcysts.[22]
Endoscopic ultrasound (EUS) can readily identify pancreatic cysts through high-resolution imaging. When EUS is used in addition to other imaging modalities, the accuracy of diagnosis is greatly improved by providing high-quality imaging and detecting small areas of closely assembled microcysts. EUS allows for accurate diagnosis in all cases misdiagnosed by other imaging modalities. EUS-guided fine needle aspiration usually provides a definitive diagnosis, but the sensitivity may decrease when there is no adequate sample for analysis.[9][23][24] On EUS, serous cystadenoma usually has multiple small, anechoic cystic areas with thin septations. Because of the vascular nature of serous cystadenoma, aspirates are thin and sometimes bloody or contain hemosiderin-laden macrophages.[25]
Pancreas Cyst fluid analysis includes chemical analysis (Amylase), tumor markers (carcinoembryonic antigen (CEA), carbohydrate antigen(CA19-9), and cytology. Serous cystadenoma shows low viscosity, low amylase level, and low CEA levels (<5 to 20 ng/mL), with variable levels of pancreatic enzymes such as Amylase isoenzymes and CA-125. Cancer antigen (CA 72-4) level is low as well. Cytology reveals cuboidal cells with glycogen-rich cytoplasm. Combining these parameters helps classify these cysts and differentiate serous cystadenoma from malignant or mucinous cysts.[26] Cyst fluid DNA analysis may reveal a mutation in VHL among patients with VHL syndrome.[27]
Treatment / Management
When diagnosing pancreatic serous cystadenoma based on clinical and radiographic evidence, non-surgical management should be recommended in asymptomatic cases. Surveillance imaging can be safely recommended based on these cysts' slow growth rate. This is due to the small risk of malignancy (<3%).[28] Surgical resection should be the next step in the management of symptomatic patients due to rapidly growing lesions (cystadenoma itself vs. hemorrhage), giant tumors more than 10 cm (causing mass effect, obstructive jaundice, pancreatic duct obstruction causing pancreatic exocrine insufficiency or gastric outlet obstruction) or when malignancy (for example serous cystadenocarcinoma) cannot be excluded.[29] Although the increased size does not predict malignancy, large lesions are usually known to grow faster, making them more likely to cause symptoms.[3] The surgical approach depends on the location and may include distal pancreatectomy with or without splenectomy, mid pancreatectomy, or Whipple procedure. Enucleation was previously reported as a safe option for well-selected patients with serous cystadenoma, preserving the endocrine and exocrine pancreas function.[30](B2)
Differential Diagnosis
Differential diagnosis of pancreatic cystic lesions could be difficult, especially if it is based solely on radiological studies. It is known that most pancreatic cystic lesions are inflammatory, which are considered pseudocysts, and the minority are considered neoplastic.[23][24][31] It is equally problematic to distinguish benign serous from mucinous (mucinous cystic neoplasm) and malignant mucinous lesions (mucinous cystadenocarcinoma), therefore implementing radiologic, morphologic and laboratory tests help in distinguishing these lesions before resection and assessing their malignant potential. It is also essential to distinguish pseudocysts from serous lesions as it is essential for planning appropriate surgical management.[23][24][31] A rare entity of cystic pancreatic lesions includes cystic islet cell tumors, papillary cystic lesions, and lymphoepithelial cysts. The differential diagnosis for serous cystadenomas can be summarized as follows:
- Non-neoplastic pancreatic cysts: true cysts, retention cysts, mucinous non-neoplastic cysts, lymphoepithelial cysts.
- Pancreatic cystic neoplasms include mucinous, intraductal papillary mucinous neoplasms and solid pseudopapillary neoplasms.
- Cystic degeneration in solid pancreatic tumors includes ductal carcinoma, acinar cell carcinoma, and endocrine tumors.
Prognosis
Serous cystadenomas are considered benign with a small malignant potential (<3%). During long-term follow-up in a clinical study of 18 patients with serous cystadenomas, the following morphologic changes were seen in 3 tumors (17%): microcystic serous cystadenoma changed to macrocystic serous cystadenoma and was associated with tumor enlargement in 1 patient, macrocystic serous cystadenoma changed to micro and macrocystic serous cystadenoma resulting in a mixed type with tumor enlargement in the second patient. In the third patient, the macrocystic serous cystadenoma changed to a microcystic serous cystadenoma with associated tumor shrinkage from 30 to 25 mm. So, of the 18 patients, 9 cases (50%) had an enlargement of the tumor, and in the remaining 9 cases (50%), there was no change in size. The median growth rate was 0.29 cm per year.[29] The prognosis for patients with serous cystadenomas is excellent. Even in rare cases of serous cystadenocarcinoma, there are reports of long-term survival after resection. Studies also conclude that any serous cystadenoma has the potential to grow with time, regardless of the tumor subtype, size, or location. That's why all serous cystic neoplasms should be followed up regularly.
Complications
Physicians must evaluate the risks and benefits of surveillance imaging vs. surgical resection. Operative mortality was probably underestimated. Pancreatic surgical morbidity in the short and long term remains high, with pancreatic fistulae formation and exocrine or endocrine (diabetes mellitus) pancreatic insufficiency in around one-third of cases.[1] If growing serous cystadenomas are left untreated, they can lead to pancreatitis, obstructive jaundice due to obstruction of the biliary tree, which can lead to cholangitis, pancreatic exocrine insufficiency due to pancreatic duct obstruction, or gastric outlet obstruction.
Deterrence and Patient Education
Patient education and reassurance are essential, as most serous cystadenomas are benign. Most of these lesions are discovered incidentally on cross-sectional imaging; however, patients' knowledge of their own personal and family history regarding previous episodes of pancreatitis may lead to the formation of pseudocysts or any hereditary or genetic familial syndrome that may be associated with pancreatic lesions as in VHL syndrome can be very helpful. Patients should be counseled about the importance of reporting new symptoms such as jaundice, abdominal pain, and early satiety that warrant further investigation to assess for complicated disease and rule out pancreatic tumors. In addition, patient education about the importance of regular surveillance imaging is essential, given the great impact on the prognosis and survival rates in case the tumor grows in size or has any degree of dysplasia.
Pearls and Other Issues
Recent developments in the diagnosis and treatment of PCNs have been made. Ex vivo optical coherence tomography (OCT) of freshly resected pancreatectomy specimens has shown that mucinous cysts could be differentiated from nonmucinous cysts. OCT is an interferometric technique that typically uses near-infrared light. It allows noninvasive assessment of biological tissues by measuring their optical reflections.[32] Confocal laser endomicroscopy (CLE) is a novel imaging technology that uses a low-power laser. Needle-based CLE (nCLE) is used for intraabdominal organs under EUS guidance. The nCLE mini probe is introduced into the lesion through an FNA needle to obtain a biopsy. Pancreatitis was reported as an adverse complication in a few cases. EUS-guided pancreatic cyst ablation uses EUS guidance to inject a cytotoxic agent, either ethanol or paclitaxel, after the puncture of the pancreatic cyst. The injection of a cytotoxic agent may ablate the cyst epithelium.[33]
Enhancing Healthcare Team Outcomes
There are many suggested algorithms for managing pancreatic cystic lesions. Emphasis is placed on the size and morphology of the pancreatic cysts. The main issue in managing serous cystic neoplasm is accurately diagnosing the serous cystadenoma. Surgical intervention is only indicated if all investigations have been completed and there is still a doubt about a pancreatic neoplasm.[34] Physicians should first suggest conservative management surveillance imaging according to the available guidelines unless the initial diagnosis concerns a complicated disease or malignancy and warrants immediate intervention.
Media
(Click Image to Enlarge)
Serous Cystadenoma, CT
Contributed by C Lisanti, MD
(Click Image to Enlarge)
Cystadenoma, 4x H/E
Contributed by F Farci, MD
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