  We present interferometric and single-dish mid-infrared observations of a
sample of massive young stellar objects (BN-type objects), using VLTI-MIDI (10
micron) and Subaru-COMICS (24.5 micron). We discuss the regions S140, Mon R2,
M8E-IR, and W33A. The observations probe the inner regions of the dusty
envelope at scales of 50 milli arcsecond and 0.6 arcsec (100-1000 AU),
respectively. Simultaneous model fits to spectral energy distributions and
spatial data are achieved using self-consistent spherical envelope modelling.
We conclude that those MYSO envelopes that are best described by a spherical
geometry, the commensurate density distribution is a powerlaw with index -1.0.
Such a powerlaw is predicted if the envelope is supported by turbulence on the
100-1000AU scales probed with MIDI and COMICS, but the role of rotation at
these spatial scales need testing.
