CASE 147 (May 2018)
A 52-year-old woman, with no pathological personal history, is evaluated by presenting pain in the flank and persistent microhematuria, 2 months of evolution. Image studies showed a mass of 2 cm in diameter in the renal hilum, adjacent to the main artery and vein and in contact with the wall of the pelvis.
Given the difficulties for a possible complete resection of the lesion without injuring the hilum, a nephrectomy was decided.
Observe the images. (Case received in our service as interconsultation, we do not have macroscopic images of the specimen)..
Figure 2. H&E, X100.
Figure 3. H&E, X100.
Figure 4. H&E, X40.
Figure 5. H&E, X200.
Figure 6. H&E, X200.
Figure 7. H&E, X400.
Immunohistochemistry: The cells in the periphery of the lesion (those seen in figures 5, 6 and 7) are predominantly positive for CD68 or CD31, with intermixed B and T lymphocytes. CK: Negative
What is your diagnosis?