Hello brother,
The way you have described the swelling by which your brother is suffering seems to be echoing scan report. The final word you have mentioned is The mass is separated from,but closely adherent the surrounding structures,
anal canal and
urethra is important. It should arise from any one layer of perineum
The layers and contents from superficial to deep:
1) Foreskin
2) superficial perineal fascia:
Subcutaneous tissue divided into two layers: (a) A superficial fatty layer, and (b) Colles' fascia, a deeper, membranous layer.
3) deep perineal fascia and muscles:
In Echo scan - The low signal intensity and No solid component - cases in which septations, and solid areas of
tumor are absent, it is difficult to detect signal for waveform analysis.
The mass is separated from the surrounding tissue - is a favorable point.
MRI to be done to arrive at a proper diagnosis and treatment.
Best wishes