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Crossed ectopia is a rare congenital anomaly. S-shaped (sigmoid) kidney is one of the varieties of crossed ectopia that is associated with absence of any renal tissue in the contralateral renal fossa. S-shaped malformation of an ipsilateral kidney with presence of the contralateral kidney is an extremely rare condition and, to our knowledge, has been described only once before in the literature. We present the case and discuss the hypothesis for this rare malformation. [ABSTRACT FROM AUTHOR]

A 51-year-old male patient presented with lower abdominal pain persisting since about 1 year. Abdominal computed tomography scan showed a solid tumor interpreted as urachal carcinoma with peritoneal carcinomatosis. Histopathological examination revealed urachal abscess. Awareness of clinical signs and imaging findings of this rare but characteristic condition may avoid emotional distress of patients associated with erroneous suspicion of malignancy., (Copyright © 2018 Elsevier Inc. All rights reserved.)

A 68-year-old man presented with synchronous metastatic penile and prostate cancer. 68Ga-labeled prostate-specific membrane antigen-targeted ligand positron emission tomography/computed tomography (PSMA-PET/CT) revealed tracer uptake in inguinal, pelvic, and retroperitoneal metastases. Lymph node biopsies and immunohistochemical staining revealed that both cancers involved the lymph nodes and expressed PSMA. In the deposits of penile squamous cell carcinoma, PSMA expression was seen in tumor vessels and may explain the PSMA-PET/CT positivity of inguinal nodes involved in squamous cell carcinoma. The interpretation of imaging in synchronous tumors should take this fact into consideration., (Copyright © 2016 Elsevier Inc. All rights reserved.)

A 45-year-old patient presented with prostate-specific antigen relapse after radical prostatectomy. Diagnostic workup revealed a (68)Ga-labeled prostate-specific membrane antigen-targeted ligand tracer uptaking nodule that was initially interpreted as lymph node metastasis but eventually identified as a splenunculus by scintigraphy with (99m)Tc pertechnetate-labeled heat-altered erythrocytes. Awareness of this constellation may spare unnecessary diagnostic procedures and inappropriate treatment., (Copyright © 2016 Elsevier Inc. All rights reserved.)