72-year-old female with elevated levels of the tumour marker CA 19-9 but none of the diagnostic tests showed any tumour finding. The levels of CA 19-9 remained in the pathologic range, although with decreasing values. Currently, the patient is not reporting any significant symptoms.

36-year-old otherwise healthy female presented with an atypical pap smear. Biopsy of cervix revealed poorly Differentiated Neuroendocrine Carcinoma. Immunohistochemical staining showed the cells positive for NSE, SYN, CHR, and 90% positive for Ki67 (proliferative index). The findings of the PET-FDG test showed pathological absorption of FDG as a primary tumor of the cervix, towards the left side of the body. Moreover, evidence is seen of nodal metastatic spread in the retroperitoneum and pelvis, mainly on the left.

78-year-old male was diagnosed with metastatic well differentiated neuroendocrine carcinoma with unknown primary. He recently underwent explorative laparotomy that revealed solitary metastasis in the liver, and a hard lesion in the mid-ileum suspicious for the primary carcinoid. A frozen section showed foreign body type giant cell granuloma. Left lateral segmentectomy of the liver showed a white hard lesion. The expert recommends a regular follow-up that should consist of abdominal ultrasonography combined with CT or MRI.

78-year-old male was diagnosed with Metastatic well differentiated neuroendocrine carcinoma in liver. There is an undefined finding in the cecum that might be the primary tumor, and hepatic metastases that can be surgically respected. The imaging tests support the assumption that the primary tumor is in the small intestine.

36-year-old otherwise healthy female underwent routine tests that found atypical cells in Pap smear. Her cervix was biopsied, and found poorly differentiated neuroendocrine carcinoma. The findings of the PET-FDG test showed pathological absorption of FDG as a primary tumor of the cervix, towards the left side of the body. Moreover, evidence is seen of nodal metastatic spread in the retroperitoneum and pelvis. In the expert's opinion the patient has locally extensive small cell neuroendocrine carcinoma of the cervix with extensive pelvic and PA adenopathy.