Clinical Reasoning

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Clinical Reasoning RESIDENT & FELLOW SECTION Clinical Reasoning: Section Editor A 49-year-old woman with progressive Mitchell S.V. Elkind, MD, MS motor deficit Ana Monteiro, MD SECTION 1 strength, and difficulty protruding the tongue, without Amélia Mendes, MD A previously healthy 49-year-old woman presented with fasciculations or atrophy. Symmetrical tetraparesis Fernando Silveira, MD progressive motor deficit. The complaints started the (proximal-greater-than-distal weakness) and increased Lígia Castro, MD year before with weakness of the right arm. Over the tone were noted, with severe pain upon mobilization Goreti Nadais, MD subsequent months, she developed weakness in the left and palpation of joints and muscles. Deep tendon reflexes arm, followed by both legs, and, finally, difficulty speak- were brisk and symmetric, with bilateral flexor plantar ing, with nasal voice, and swallowing. It was increasingly responses. There was atrophy of the interosseous muscles Correspondence to difficult to attend to her chores, and, by the time she of the hands and shoulder girdle muscle wasting. Dr. Monteiro: sought medical attention, she needed help with all daily [email protected] Questions for consideration: activities. In the last few weeks, she also complained of diffuse joint and muscle pain. Medical and family history 1. How do you localize the symptoms: upper motor were unremarkable. neuron (UMN) or lower motor neuron (LMN), Neurologic examination showed bilateral facial weak- neuromuscular junction (NMJ), peripheral nerve, ness, severe dysarthria, dysphonia and dysphagia (nau- or muscle? What is the broad differential? seous reflex preserved), decreased shoulder elevation 2. What findings on examination would be helpful? GO TO SECTION 2 Supplemental data at Neurology.org From the Departments of Neurology (A. Monteiro, A. Mendes, F.S., G.N.) and Pathology (L.C.), Centro Hospitalar São João; and the Department of Clinical Neurosciences and Mental Health (A. Monteiro, A. Mendes), Faculty of Medicine, University of Porto, Portugal. Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article. e124 © 2014 American Academy of Neurology ª 2014 American Academy of Neurology. Unauthorized reproduction of this article is prohibited. SECTION 2 combination of LMN signs at the level of the abnor- The presentation suggested the presence of bulbar (dys- mality with UMN signs below it. This condition also arthria, dysphonia, and dysphagia), LMN (weakness, includes sensory abnormalities and sphincter dysfunc- muscle wasting), and UMN (brisk reflexes, increased tion, but these features may be absent. However, the tone) symptoms. NMJ disorders were not considered bulbar findings would be harder to explain, although since there was no history of ptosis, extraocular muscle syringobulbia or a foramen magnum tumor could be dysfunction, or fluctuating symptoms, although bulbar present, and the arthralgia and myalgia were not ac- and proximal muscle weakness are common. counted for. However, the patient did not complain Motor neuron disease (MND) was considered ini- of occipital or upper cervical pain, early symptoms of tially. The insidious course, with signs and symptoms foramen magnum meningiomas. Cervical MRI was compatible with UMN and LMN dysfunction present performed, without abnormalities. The absence of sen- in one body segment and followed by spread to other sory signs, the bulbar symptoms, and the quality of the segments over several months, was the rationale for this pain also argued against myelopathy at lower levels, reasoning. However, the pain complaints did not quite radiculopathy, or peripheral nerve disease. Neuropathic fit this diagnosis. Cervical radiculomyelopathy, such as pain is usually continuous or paroxysmal with associ- cervical spondylosis, with nerve root compression ated dysesthesia and allodynia. Radicular pain radiates was considered as a differential, as it could cause the along the corresponding dermatome of the injured nerve. The pain complaints were more congruent with muscle and joint pathology. HIV infection and hyper- thyroidism were included in the differential but were Figure 1 Abnormalities upon physical examination negative. Inflammatory muscle disease could be consid- ered given the muscle wasting and weakness and severe myalgia, but the brisk reflexes contradicted this hypothesis. However, anxiety may cause brisk reflexes and their symmetry and the presence of flexor plantar responses could be clues to a nonpathologic nature. EMG studies were ordered to discern whether nerve, muscle, or NMJ dysfunction was present, and revealed myopathic changes. On closer inspection, some abnormalities were noted: the patient appeared emaciated; there was marked skin thickening over the face, hands, forearms, and feet; and there were areas of skin hypopigmenta- tion and hyperpigmentation with “salt-and-pepper” appearance. The nose was thin and there was decreas- ing of frontal and nasolabial skin folds, microstomia, cheek telangiectasias, and sclerodactilia, with contrac- ture of distal phalangeal joints (figure 1). The remain- ing physical examination was normal. Questions for consideration: (1) Thickening of the skin over the face, hands, and forearms, (2) sclerodactilia and distal pha- langeal joint contractures, (3) skin hypopigmentation and hyperpigmentation (“salt-and-pepper” appearance), (4) skin folds diminished, (5) microstomia, (6) telangiectasias, (7) muscle atrophy 1. What is the differential diagnosis at this point? at the interosseous muscles, and (8) shoulder girdle. 2. What diagnostic testing would you order? GO TO SECTION 3 Neurology 82 April 15, 2014 e125 ª 2014 American Academy of Neurology. Unauthorized reproduction of this article is prohibited. SECTION 3 anti-SSb,anti-Scl-70,anti-Jo1,anti-RNP,anticentro- The investigation was refocused due to these observa- mere, and antineuronal antibodies were negative. tions. Idiopathic inflammatory myopathy (IIM), namely Skin and muscle biopsy were compatible with scle- dermatomyositis, could present skin abnormalities. How- roderma and polymyositis, respectively (figure e-1 on ever, there was no malar or extensor surface erythema, the Neurology® Web site at Neurology.org). There photosensitivity, heliotrope, or Gottron papules sugges- was an extensive endomysial inflammatory tive of dermatomyositis. Connective tissue disease, infiltrate (predominantly T lymphocytes), atrophic and namely systemic sclerosis, would explain the findings hypertrophic fibers, necrosis, regeneration, and diffuse upon physical examination. sarcolemmal major histocompatibility complex class I Laboratory tests revealed normal blood cell expression. Electron microscopy did not show counts and elevated erythrocyte sedimentation rate tubuloreticular structures. The diagnosis of systemic (97 mm/1st hour), creatine kinase (2,399 U/L), sclerosis-polymyositis overlap syndrome was established. aldolase (81 U/L), and myoglobin (620.5 U/L). Questions for consideration: Immunologic testing revealed positive antinuclear antibodies (title . 1/1,000); rheumatoid factor, anti- 1. Would you order additional testing? double-stranded DNA, antithyroid, anti-Sm, antinucleo- 2. What are the treatment recommendations and some, antineutrophil cytoplasmic antibodies, anti-SSa, overall prognosis? GO TO SECTION 4 e126 Neurology 82 April 15, 2014 ª 2014 American Academy of Neurology. Unauthorized reproduction of this article is prohibited. SECTION 4 contracture, (4) dermal thickening proximal to the Paraneoplastic syndrome was a concern, considering the wrists, (5) calcinosis cutis, (6) Raynaud phenomenon, rapid onset and progression. Although cancer occurs in (7) distal esophageal hypomotility/reflux esophagitis, a minority of IIM cases, the risk of associated malignancy (8) sclerodactyly/nonpitting digital edema, and (9) telan- is elevated.1 Extensive search for occult malignancy was giectasias.8 Apart from positive antinuclear antibodies performed. Cervico-thoraco-abdomino-pelvic CT scan (ANAs), no antibodies were detected in our patient. revealed a large contrast-enhancing thyroid nodule and ANA positivity has been demonstrated to be present in signs of pulmonary fibrosis but no adenopathies. The a significantly higher percentage of overlap patients (as thyroid nodule biopsy showed a benign colloid nodule. high as 96.6%) in comparison to primary myositis or Mammography and colonoscopy were normal. scleroderma patients.5 Anti-PM-Scl antibodies are con- Investigation for end-organ lesions is also manda- sidered the serologic marker of the disease.9 tory.2 ECG and echocardiogram were normal. There The presentation raised the possibility for MND, ini- was no kidney involvement. Gastrointestinal studies tially biasing the evaluation and emphasizing the impor- revealed ineffective esophageal motility, hypotensive tance of careful general physical examination. The superior esophageal sphincter, and erosive esophagitis. distinctive features upon physical examination, with Polysomnography revealed obstructive sleep apnea and abnormalities consistent with systemic sclerosis, as well pulmonary function tests showed restrictive ventilatory as the elevated serum muscle enzymes and the myo- defect. High-resolution chest CT scan confirmed the pathic changes on EMG, helped direct the investigation. interstitial lung disease, with ground-glass opacities in High-dose prednisolone (1 mg/kg/day) for 4–6 both inferior and medial lobes, septal
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