Sacral bone tumors usually remain clinically silent for a long period and are often discovered in the context of nerve root compression (S1 or S2 radiculopathy or inflammatory sciatica) or pelvic organ compression. The most common sacral tumors in adults are metastases and intraosseous locations of hematological malignancies (lymphoma or multiple myeloma), while primary bone tumors and meningeal or nerve tumors are less common; Metastatic lesions of the sacrum are rare, but pose a complex problem for surgical management. The clinical pattern of presentation depends on the anatomical location of the tumour and whether it invades or compresses neighbouring structures. We report the case of a 67-year-old man who presented with a 2-year history of intermittent low back pain with sudden urinary retention. Additionally, he was under care for chronic constipation and fecal impaction. A lumbar computed tomography (CT) scan and magnetic resonance imaging shows a heterogenous mass occupying The sacrum to the coccyx with 12-10-8 cm in size (A) . A needle biopsy revealed that this lesion was an infected metastatic carcinoid (B).

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Corresponding author
Hassan Baallal, Department of Neurosurgery, Avicenne Military Teaching Hospital, University Kaddi Ayyad, Marrakech, Morocco (baallalnch@gmail.com)