Question: List co-morbidities that may occur together with "Stiff man Syndrome"

Context:
To report an association between two autoimmune conditions, Graves' disease and stiff-person (stiff-man) syndrome, and discuss the relevant literature.
This case illustrates the association between TRAB-positive Graves' disease and stiff-person syndrome and the improvement of Graves' disease with immunosuppressive therapy.
HCV may be the etiologic virus of progressive encephalomyelitis with rigidity; a rare disorder similar to stiff-man syndrome although different because it is progressive and fatal.
The triad of stiff-man syndrome, breast cancer, and autoantibodies against amphiphysin identifies a new autoimmune paraneoplastic syndrome of the CNS.
GAD has been suggested as an autoantigen in insulin-dependent diabetes mellitus and stiff-man syndrome
Stiff-man syndrome (SMS) is a rare disorder of the central nervous system of probable autoimmune origin.
Patients with SMS often have other autoimmune diseases, in particular type I (insulin-dependent) diabetes mellitus (IDDM).
GAD-65 is a dominant autoantigen in stiff-man syndrome and insulin-dependent diabetes mellitus.
In this group, there is a striking association of the stiff-man syndrome with organ-specific autoimmune diseases, primarily insulin-dependent diabetes mellitus.
We studied three women with the stiff-man syndrome and breast cancer,
RESULTS: Autoantibodies directed against a 128-kd brain protein were found in two of the women with the stiff-man syndrome and breast cancer. These results led to a search for breast cancer in the third patient with the stiff-man syndrome, who also had autoantibodies. A small invasive ductal carcinoma was detected by ultrasonography and removed.
CONCLUSIONS: In a subgroup of patients with the stiff-man syndrome, the condition is likely to have an autoimmune paraneoplastic origin. The detection of autoantibodies against the 128-kd antigen in patients with this syndrome should be considered an indication to search for an occult breast cancer.
We have previously reported the presence of autoantibodies against glutamic acid decarboxylase (GAD) in a patient with stiff-man syndrome, epilepsy, and insulin-dependent diabetes mellitus.
These findings support the hypothesis that stiff-man syndrome is an autoimmune disease and suggest that GAD is the primary autoantigen involved in stiff-man syndrome and the associated insulin-dependent diabetes mellitus.
An elderly man with progressive dementia and concomitant development of stiff-man syndrome is described. He had not had stiff-man syndrome one year earlier, when he had only mild dementia. An association between stiff-man syndrome and dementia has not been previously described.
It is possible that this patient represents an exaggerated form of such motor disturbances in dementia, and that clinical and electromyographic features of stiff-man syndrome may be present with increased incidence in patients with dementia.

Answer: SMS (Stiff man Syndrome) is is a rare disorder of the central nervous system of probable autoimmune origin and as such is associated with other autoimmune diseases, such as Insulin Dependent Diabetes Mellitus . GAD-65 is a dominant auto-antigen that is found both in in stiff-man syndrome and insulin-dependent diabetes mellitus. TRAB -positive Graves' disease has been reported to occur together with SMS. 
In a subgroup of patients with the stiff-man syndrome, the condition is likely to have an autoimmune paraneoplastic origin. The detection of autoantibodies against the 128-kd antigen in patients with this syndrome should be considered an indication to search for an occult breast cancer.

HCV may be the etiologic virus of progressive encephalomyelitis with rigidity; a rare disorder similar to stiff-man syndrome although different because it is progressive and fatal.
It is possible that the reported case of association of progressive dementia with concomitant development of stiff-man syndrome in an elderly man represents an exaggerated form of such motor disturbances in dementia, and that clinical and electromyographic features of stiff-man syndrome may be present with increased incidence in patients with dementia.
Exact answer: Insulin Dependent Diabetes Mellitus
type I (insulin-dependent) diabetes mellitus (IDDM)
Grave's disease
Breast Cancer
Dementia