[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2018-12-11.12:26:17]

"PatientSex" is a mandatory type 2 DICOM tag, as can be seen using dicom3tools:

```text
$ dciodvfy /tmp/CR000000.dcm 2>&1 | grep Error
Error - Missing attribute Type 2 Required Element=<PatientSex> Module=<Patient>
Error - Missing attribute Type 1C Conditional Element=<DeidentificationMethod> Module=<Patient>
Error - Missing attribute Type 1C Conditional Element=<DeidentificationMethodCodeSequence> Module=<Patient>
Error - Missing attribute Type 2 Required Element=<ReferringPhysicianName> Module=<GeneralStudy>
Error - Missing attribute Type 2 Required Element=<StudyID> Module=<GeneralStudy>
Error - Missing attribute Type 2 Required Element=<AccessionNumber> Module=<GeneralStudy>
Error - Attribute present when condition unsatisfied (which may not be present otherwise) Type 2C Conditional Element=<Laterality> Module=<GeneralSeries>
```

I guess the images from the first comment are invalid as well