Israel Medical Association Journal

Solid pseudopapillary neoplasms (SPNs) of the pancreas are rare tumors arising from pancreatic tissue, predominantly affecting young women and possessing low malignant potential. Extrapancreatic SPNs are exceedingly uncommon. According to data from the English literature, only 30 cases of extrapancreatic SPNs had been reported by 1990, accounting for less than 1% of all reported SPNs from 2004 to 2018. The testis, paratesticular region, and ovary are the more frequently documented sites of these tumors [1,2]. Notably, to the best of our knowledge, no cases of SPN originating in the diaphragm have been reported in the English literature to date. The prevailing theory suggests that SPNs behave similarly regardless of whether they originate in the pancreas or in extrapancreatic locations.

We present the case of a 79-year-old female with a history of lung and endometrial cancer, who was diagnosed with a liver lesion during a routine follow-up ¹⁸F-fluorodeoxyglucose positron-emission tomography/computed tomography (¹⁸F-FDG PET/CT). During surgery, the lesion was resected from the diaphragm and was confirmed to be consistent with the pathological findings of SPN.

Neuroendocrine tumors (NETs) are a group of rare, heterogenous neoplasms that maintain unique morphologic and clinical features of neuroendocrine neoplasia and account for approximately 0.5% of all newly diagnosed malignancies. NETs are divided into two groups based on their histopathological morphology: well-differentiated neuroendocrine tumors (NETs) and poorly differentiated neuroendocrine carcinomas (NECs). Well differentiated NETs are classified as G1, G2, or G3 based on their proliferation rate, whereas NECs are highly proliferative and poorly differentiated by definition [1]. Neuroendocrine neoplasms can occur almost anywhere in the body; however, they are most often seen in the gastrointestinal tract, pancreas, and lungs [2]. The extrahepatic bile duct is one of the rarest primary sites for NETs, accounting for 0.1% to 0.2% of NETs of the gastrointestinal tract [3]. Signet ring cell bile duct NETs are extremely uncommon and have no established incidence and prognosis due to their rarity. There is sparse information available regarding these tumors, and only a few cases have been reported in the literature to date. In this report, we presented the clinical course and surgical management of a 31-year-old female patient with a Klatskin signet ring cell NET.