PMC9744598_01
Sagittal T1-weighted preoperative MRI with contrast showing an anterior intradural extramedullary mass, measuring 1.6 x 0.9 x 2.8 cm (blue arrow). The mass is centered at C5 and spans from C4-6 with what appears to be a dural tail. The mass shows significant compression of the spinal cord.
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fig1
A dural tail, centered at the level of the fifth cervical vertebra, was present, with enhancement and cord compression (Figure 1).
Longitudinal section revealing degenerating Onchocerca lupi nematode encased in inflamed, dense fibrous tissue. Lillie-Twort Gram stain, original magnification x25.
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fig2
Within a few fragments of tissue were remnants of foreign material compatible with the cuticular wall of a degenerating nematode (Figure 2), for which morphological details could be emphasized using a trichrome stain.
Trichrome-stained sections of O. lupi revealing relevant morphological features ((a) 200x magnification and (b) 400x magnification). Arrows indicate external cuticular ridges, and arrowheads indicate internal striae.
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fig3
Longitudinal sections of the cuticular wall revealed two inner striae per ridge, morphologically compatible with O. lupi, likely damaged by host immune response (Figure 3).