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MRI of pelvis with contrast showing a large encapsulated mass located at the presacral region from S1 to S3 measures 7.5 x 6.6 x 9.7 cm in transverse, AP, and long axis respectively.
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CT scan and MRI which showed a solid mass in the presacral area (Fig. 1). CT guided true cut biopsy was taken and came back positive for schwannoma.
Macroscopic image showing the large mass after resection.
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The tumor was excised (Fig. 2), and histopathology report confirmed the diagnosis of Schwannoma (Fig. 3).
PMC6675969_02
PET scan showing moderate FDG avidity within well circumscribed rounded mass in the left pelvis measures 6.2 x 5.7 cm axially.
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The PET scan showed a mass in the left pelvic area demonstrating a moderate uptake with possible malignant process (Fig. 4).
Histopathology slide showing spindle cell lesion with diffuse s100 staining consistent with schwannoma.
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The patient couldn't go for a CT guided true cut biopsy due to the difficult position of the mass as explained by the interventional radiologist, as well as the patient's body built and narrow pelvis. The patient then was scheduled for exploratory laparotomy and total tumor resection. The tumor was excised, and histopathology report came positive for the diagnosis of Schwannoma (Fig. 5).