MS can be confused with other autoimmune diseases such as Sarcoidosis and or Clippers

Yes. Two different autoimmune diseases can look like MS, and one of them, sarcoidosis, is a reason to double-check the MS label before committing to aHSCT.

The retrieved review lists sarcoidosis and several other immune conditions as part of the MS differential diagnosis, and it explicitly flags the risk of misdiagnosis [1]. Neurosarcoidosis produces cranial nerve problems, meningoencephalitis, optic nerve damage, and spinal cord disease, with basilar meningitis and leptomeningeal enhancement on MRI and non-caseating granulomas on biopsy [1]. MS shows periventricular and juxtacortical lesions, while NMOSD shows long spinal cord lesions and area postrema involvement; the review calls MS-versus-NMOSD mismatch a real misdiagnosis hazard [1]. What these records do not cover is "Clippers" (I take that as CLIPPERS, a brainstem inflammation syndrome) or a study measuring how often MS is actually misdiagnosed as sarcoidosis. That gap is real.

This matters for your aHSCT question directly. The transplant cohorts enrolled RRMS and did not screen out lookalike diseases in the records shown [2][3]. If the diagnosis is wrong, the chemo reset is aimed at the wrong target, and the risk was paid for nothing.

My call: get the diagnosis confirmed by CSF, MRI, and antibody testing before you accept aHSCT as an option. If any of these lookalikes is still live, do not proceed. Confidence: moderate on the misdiagnosis risk, low on how often it happens.