Cervical dystonia mimicking dropped-head syndrome after radiotherapy for laryngeal carcinoma

Movement Disorders Associated With Radiotherapy and Surgical Procedures

Occasionally, movement disorders can occur following interventional procedures including but not limited to radiotherapy, dental procedures, and cardiac, cerebral and spinal surgeries. The majority of these disorders tend to be unexpected sequelae with variable phenomenology and latency, and they can often be far more disabling than the primary disease for which the procedure was performed. Owing to poor knowledge and awareness of the problem, delays in diagnosing the condition are common, as are misdiagnoses as functional movement disorders. This narrative review discusses the phenomenology, pathophysiology, and potential treatments of various movement disorders caused by interventional procedures such as radiotherapy and neurological and non-neurological surgeries and procedures.

Cervical Dystonia Mimics: A Case Series and Review of the Literature

Background

Cervical dystonia is mostly idiopathic in nature. However, a small subset of cases are mimics, leading to diagnostic pitfalls. There is paucity of literature on pseudodystonias affecting the cervical region.

Method

We performed a retrospective review of patients attending a movement disorders clinic over a period of 7 years (2012–2018). Among them, those who were considered to have mimics of cervical dystonia based upon clinical and supportive investigations were included.

Results

Six out of 2,412 patients (0.24%) were diagnosed as cervical dystonia mimics and the causes included isolated neck extensor myopathy (2), craniovertebral junction anomalies (2), sternocleidomastoid fibrosis (1) and post traumatic sequelae (1). Among these patients, three patients had received various treatments for cervical dystonia, including botulinum toxin injections.

Discussion

Mimics of isolated cervical dystonia are rare. A high degree of suspicion and proper diligent clinical assessment assists management and prognostication.

Dropped head syndrome due to neuromuscular disorders: Clinical manifestation and evaluation

In this article, we discuss the clinical approach to patients with dropped head syndrome and identify the various neuromuscular causes of dropped head syndrome including muscle, neuromuscular junction, peripheral nerve and motor neuron etiologies. We aim to increase awareness of recognition the entity of dropped head syndrome and factors that may predict response to immunomodulating therapy in dropped head syndrome.

Botulinum toxin for radiation-induced facial pain and trismus

OBJECTIVE

To report the efficacy of botulinum toxin A for radiation-induced pain, trismus, and masticator spasm in head and neck cancer.

PATIENTS AND METHODS

This prospective nonrandomized study included patients in complete remission with radiation-induced pain and trismus with or without masticator spasms. Fifty units of Botox (Allergan) or 250 units of Dysport (Ipsen) were injected transcutaneously into the masseter muscles. Jaw opening was measured and patients answered 20 questions about jaw opening, pain, and cramps, before injection at 1 month.

RESULTS

Nineteen patients (7 women, 12 men) were included. Median time after radiation therapy was 5 years (range, 11 months to 22 years). At 1 month, no significant increase in jaw opening was recorded. Improvement was noted in the functional domain (P = 0.004), for pain (P = 0.002) and cramps (P = 0.004), but not in the social (P = 0.83) or emotional (P = 0.43) domains. No side effects occurred.

CONCLUSIONS

Botulinum toxin did not improve trismus but significantly improved pain scores and masticator spasms (oromandibular dystonia).

Isolated head drop triggered by neck surgery following concomitant chemoradiotherapy

Dropped head syndrome (DHS) is characterized by severe weakness of neck extension that occurs in isolation or association with a generalized neuromuscular disorder. Multietiologies may be responsible for DHS, including radiotherapy, which may cause a delayed form of DHS. However, DHS acutely triggered by neck surgery after chemoradiotherapy is rare. The author reports a case of acute onset of isolated DHS following selective neck dissection surgery after concomitant chemoradiotherapy for laryngeal cancer.

Late appearance of dropped head syndrome after radiotherapy for Hodgkin's disease

We present three cases of dropped head syndrome that occurred as a complication of mantle field (i.e., lymph nodes of the neck, axillae, and mediastinum) or whole-body radiation therapy for Hodgkin's disease. These cases are characterized by a late onset (2-27 years after radiation treatment), fibrosis, and contraction of the anterior cervical muscles, and atrophy of the posterior neck and shoulder girdle. This report adds to the increasing literature about the late neurological complications of radiation therapy and describes a previously unrecognized cause of dropped head syndrome.

[Dropped head syndrome: report of two cases]

PURPOSE

The dropped head syndrome is characterized by an abnormal bending of the head to the body, mainly affecting old people. It corresponds to an alteration of the cervical extensor muscles, revealing in some cases a neuromuscular disease. In some cases, the etiology of this syndrome remains unknown.

EXEGESIS

We report here two cases with dropped head syndrome. The first clinical case concerned a 78-year old man, presenting a dropped head syndrome revealing a myasthenia. The syndrome disappeared with specific therapy. The second clinical case was a dropped head syndrome developed in the context of severe depressive syndrome in a 71-year old woman. The etiological screening did not reveal any underlying disease. Counteracting the syndrome was successfully obtained with early physiotherapy.

CONCLUSION

The dropped head syndrome can reveal a general disease such as myasthenia or amyotrophic lateral sclerosis. Therefore, investigation needs first to eliminate underlying diseases. If no etiology is found, the dropped head syndrome is considered of an unknown neuromuscular origin or a psychosomatic disease. In this latter case, physiotherapy may be beneficial.