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  Indian J Med Microbiol
 

Figure 1: A 52-year-old patient presented with bleeding per rectum. Biopsy revealed features consistent with malignant melanoma. FDG PET/CT was done as baseline imaging. MIP image (a) shows no abnormal focal increased tracer uptake in the pelvic region. No focus of hypermetabolism or soft tissue lesion is seen in the anal canal region. Postsurgery histopathology results revealed submucosal malignant melanoma of rectum with reactive regional nodes. Thus, PET/CT showed false-negative results at the primary tumor site. MIP (b) and fused (c) images show focal uptake in the reactive right hilar node. FDG: Fluorodeoxyglucose; PET/CT: Positron emission tomography/computed tomography; MIP: Maximum Intensity Projection

Figure 1: A 52-year-old patient presented with bleeding per rectum. Biopsy revealed features consistent with malignant melanoma. FDG PET/CT was done as baseline imaging. MIP image (a) shows no abnormal focal increased tracer uptake in the pelvic region. No focus of hypermetabolism or soft tissue lesion is seen in the anal canal region. Postsurgery histopathology results revealed submucosal malignant melanoma of rectum with reactive regional nodes. Thus, PET/CT showed false-negative results at the primary tumor site. MIP (b) and fused (c) images show focal uptake in the reactive right hilar node. FDG: Fluorodeoxyglucose; PET/CT: Positron emission tomography/computed tomography; MIP: Maximum Intensity Projection