Parry-Romberg syndrome with hemimasticatory spasm in pregnancy; A dystonia mimic

Introduction

Parry-Romberg syndrome (PRS) is an uncommon acquired neurological disorder which includes progressive hemifacial atrophy involving the fat, skin, connective tissue, and sometimes bone.[1] The severity ranges from mild asymmetry to severe disfigurement. PRS may be overlapped with various clinical entities like tongue atrophy, hemimasticatory spasm (HMS), linear scleroderma, epilepsy, migraine, facial pain, and dermatologic manifestations like vitiligo and hyperpigmentations.[1] Since the first description by Caleb Parry (in 1815) and by Moritz Romberg (in 1846), several anecdotal case reports have been subsequently documented.[1] PRS and HMS are known to co-occur which affects unilateral muscles of mastication.

Case Report

A 35-year-old female, mother of single child, has been experiencing intermittent involuntary painful spasms and locking of jaw for 2-3 min, resulting in frequent tongue bites. This symptom developed during her 5^th month of pregnancy and dramatically worsened in subsequent gestation period. The initial frequencies in 5^th and 6^th months of pregnancy were 2-3 episodes per day and subsequently increased to 6-8 times per day. The intensity of spasms was also severe for which the patient was socially embarrassed and occasionally cried during those periods. One month after delivery, the spasms began to diminish rapidly and progressively dropping to lesser intensity of brief spasm of frequency 2-3 episodes per day which persisted till next 2 year when she consulted us and get into hospitalization.

She frequently developed spasms while eating, laughing, and sometimes even during normal conversation. The spasms persisted during sleep, disturbing, and sometimes awakened her from it. During the spasm, she used to do certain manoeuvre like rubbing her hand to the left face and tried to open her jaw to get rid of it. She denied dysarthria, dysphagia, or breathing difficulty. There was no associated dystonia, tremor, myoclonus, or other involuntary movements. After 4 months of onset of the above symptoms, she noticed progressive thinning of the left half of face including the tongue.

General physical examination was unremarkable. Neurological examination disclosed marked wasting of left side of the face over the cheek, mandible, and temple [Figure 1]. There was no weakness of face or muscles of mastication. Left half of the tongue was atrophied without any weakness, fasciculations, or impairment of taste sensation [Figure 2]. The right face was spared. Jaw jerk was absent. Sensory examination of face including corneal reflex was normal. Gag reflex and palatal movement on phonation were normal. She did not have hyperpigmentation, depigmentation, skin thickening, or tightness of the face or body. Rest of neurological examination was normal. Examinations of cardiovascular, respiratory, gastrointestinal, or musculoskeletal system were noncontributory. Family history was insignificant.

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Figure 1

(a and b) Left hemifacial atrophy involving cheek, masseter, and temple (arrow)

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Figure 2

Atrophy of left half of tongue (arrow)

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Routine blood investigations were normal. Markers for human immunodeficiency virus, hepatitis B and C virus and syphilis were negative. Magnetic Resonance Imaging of brain and magnetic resonance angiogram of intracranial vessels were normal. Vasculitic profiles including rheumatoid factor, antinuclear antibody, anti-dsDNA antibody, anti-Scl70 antibody, anti-topoisomerase, anti-centromere antibody, anti-histone antibody were negative. Electroencephalogram, blink reflex, and facial nerve conduction study were normal. Needle electromyography of bilateral facial muscles including massater, temporalis, and mentalis was performed. Spontaneous activities such as high frequency complex repitive discharges were found in left masseter and temporalis muscle [Figure 3] with normal motor unit potentials. Skin biopsy could not be performed due to unwillingness by the patient.

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Figure 3

Needle electromyography of left masseter showing spontaneous high frequency complex repetitive discharges with normal motor unit action potentials even without spasm

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She responded partially to carbamazepine (up to 800 mg/day). The spasm frequency decreased from several times a day to once every week. Due to financial constraints, she denied injection botulinum toxin or surgical intervention. We deferred immunotherapy because of lack of evidence of scleroderma or associated cerebral findings as well as the stable course of the disease.

Discussion

PRS in combination with HMS is a neurological rarity. Most cases of PRS are sporadic with rare exception, where familial instances are documented without specific inheritance pattern.[4] The prevalence of PRS is 1 in 7, 00,000 population with female predominance and usually occurred in first two decade.[5] Late age of presentation has been rarely reported.[6] PRS is very often associated with localized scleroderma called “en coupe de sabre.”[1] PRS may be associated with tongue atrophy (25%) and HMS (35%) as in our case.[1] The spasm usually involves one or more jaw closing muscles (massetor, temporalis, and medial pterygoid) on one side. Though the obvious pathophysiology is not known, still some hypothesis was proposed by various authors both in PRS and HMS. The excitatory electrical activity of trigeminal motor root or the motor nucleus may play a role in generation of HMS.[7] The cramps like activity in HMS may be responsible for high frequency spontaneous discharges and synchronization of muscles due to lateral spread of electrical activity to adjacent nerves. Unlike HFS there is no ectatic vascular compression identified in HMS with hemifacial atrophy.[8] Progressive hemifacial atrophy may be related to trigeminal neurovasculitis secondary to cell-mediated immunity, central sympathetic dysregulation, and associated autoimmune pathology.[9]

In the present case, the symptoms were started during 5^th month of pregnancy and worsened in subsequent period of gestation. The spasms were dramatically improved after child birth. The symptoms variability look like the probable correlation between pregnancy-related hormonal imbalance and HMS. Cersósimo et al.,[10] also observed the similar findings in their report.

Hemifacial atrophy in PRS is an irreversible phenomenomenon. Progressive disease with linear scleroderma may be treated with topical steroids, ultraviolet A irradiation, immune suppressant (methotrexate, azathioprine) to halt the disease progression.[1] PRS with cerebral involvement may be treated with immunosuppressive drugs.[11] In “burnt out” case, various aesthetic procedures have been employed. Local injection of calcium hydroxyl apatite has been shown to be helpful in patients with hemifacial atrophy.[12] Autologous fat cell transplantation has been found to be useful in long-term corrections of facial atrophy.[13] Treatment of HMS is challenging. Pharmacotherapy includes carbamazepine, phenytoin with variable results. Botulinum toxin injection into the masticatory muscles is the treatment of choice in HMS.[14]

Our patient had no history of migraine, epilepsy, facial pain, systemic, or localized scleroderma. We highlight some unique features in the present case, (1) The late age of presentation (onset at 33 years), (2) onset and worsening during pregnancy, (3) presence of sensory trick (rubbing the affected side of the face to relieve the symptoms) very often confused jaw closing dystonia, and (4) relatively good response to carbamazepine unlike other series.