diff --git a/fileformats/medimage/__init__.py b/fileformats/medimage/__init__.py
index 031f0f1..298ae04 100644
--- a/fileformats/medimage/__init__.py
+++ b/fileformats/medimage/__init__.py
@@ -1,6 +1,6 @@
 from ._version import __version__
 from .base import MedicalImage
-from fileformats.misc import Dicom  # imported to alias it here as well
+from fileformats.application import Dicom  # imported to alias it here as well
 from .misc import (  # noqa: F401
     Analyze,
     Mgh,
diff --git a/fileformats/medimage/dicom.py b/fileformats/medimage/dicom.py
index 3ef8837..9ef2c98 100644
--- a/fileformats/medimage/dicom.py
+++ b/fileformats/medimage/dicom.py
@@ -1,6 +1,6 @@
 from fileformats.core import mark
 from fileformats.generic import Directory, TypedSet
-from fileformats.misc import Dicom
+from fileformats.application import Dicom
 from .base import MedicalImage
 
 # =====================================================================
diff --git a/fileformats/medimage/misc.py b/fileformats/medimage/misc.py
index 6dc18bf..f274d33 100644
--- a/fileformats/medimage/misc.py
+++ b/fileformats/medimage/misc.py
@@ -43,4 +43,5 @@ class Mgz(Gzip[Mgh]):
     See https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/MghFormat
     """
 
+    iana_mime = "application/x-mgh+zip"
     ext = ".mgz"
diff --git a/fileformats/medimage/nifti.py b/fileformats/medimage/nifti.py
index a4f2315..a0d60c3 100644
--- a/fileformats/medimage/nifti.py
+++ b/fileformats/medimage/nifti.py
@@ -3,9 +3,9 @@
 from fileformats.core import mark
 from fileformats.core.mixin import (
     WithSideCars, WithMagicNumber, WithAdjacentFiles)
-from fileformats.serialization import Json
+from fileformats.application import Json
 # from fileformats.text import Tsv
-from fileformats.archive import Gzip
+from fileformats.application import Gzip
 from .base import MedicalImage