Case of the Week Diagnoses

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• Pantothenate Kinase-Associated Neurodegeneration (PKAN)
• Papillary Glioneuronal Tumor
• Papillary Tumor of the Pineal Region
• Papillary Tumor of the Pineal Region (PTPR)
• Paradoxical Cerebral Herniation
• Parahippocampal Gray Matter Heterotopias, Dysplastic Left Cerebellum
• Paraneoplastic Limbic Encephalitis
• Parry Romberg Syndrome (PRS)
• Parry-Romberg Syndrome
• Parsonage-Turner Syndrome
• Parsonage-Turner Syndrome
• Pediatric Intervertebral Disc Calcification
• Pelizaeus-Merzbacher Disease (PMD)
• Perimesencephalic Subarachnoid Hemorrhage (PMSAH)
• Perineural cysts associated with autosomal dominant polycystic kidney disease (ADPKD)
• Perineural spread of squamous cell carcinoma to the greater auricular nerve
• Perineural Spread on FDG-PET/CT
• Perioperative Ischemic Optic Neuropathy
• Peripheral Primitive Neuroectodermal Tumor
• Perisylvian lipoma associated with a left lentiform nucleus infarct
• Persistent Hyperplastic Primary Vitreous (PHPV)
• Persistent Hypoglossal Artery
• Persistent hypoglossal artery with synchronous left internal carotid and basilar artery occlusion
• Persistent Primitive Hypoglossal Artery with Ipsilateral ICA Occlusion, Left
• Persistent Stapedial Artery (PSA)
• Persistent Trigeminal Artery
• Petrous Apex Cephalocele
• Petrous Apex Chondrosarcoma in Ollier Disease (Enchondromatosis)
• Petrous ICA Aneurysm
• Petrous ICA Dissection
• Petrous Internal Carotid Artery Aneurysm
• Pigmented Villonodular Synovitis of the Temporomandibular Joint
• Pilocytic Astrocytoma
• Pilocytic Astrocytoma of the Spinal Cord
• Pilomyxoid Astrocytoma
• Pineal Parenchymal Tumor of Intermediate Differentiation, WHO grade 3
• Pineoblastoma
• Piriformis syndrome caused by a split piriformis muscle
• Pituitary Abscess
• Pituitary Apoplexy
• Pituitary Apoplexy with Subarachnoid Hemorrhage and Todd Paralysis
• Pituitary Carcinoma
• Pituitary Macroadenoma
• Pituitary Macroadenoma in the Setting of Multiple Endocrine Neoplasia (MEN) Type 1
• Pituitary Siderosis
• Pituitary Stalk Tuberculoma
• Pituitary Stone
• Pleomorphic Adenoma of the Parotid Gland
• Pleomorphic Xanthoastrocytoma (PXA)
• Pneumorrhacis
• POEMS Syndrome
• POLR3B Homozygous Mutation (Hypomyelinating Leukodystrophy-8)
• Polyarteritis Nodosa
• Polymicrogyria/Congenital CMV
• Polymorphous Low-grade Neuroepithelial Tumor of the Young
• Polymorphous Low-Grade Neuroepithelial Tumor of the Young (PLNTY)
• Pontine and Extrapontine Osmotic Demyelination Syndrome
• Pontine Tegmental Cap Dysplasia
• Post Laminectomy Gossypiboma
• Post-traumatic Superficial Temporal Artery Pseudoaneurysm
• Posterior Epidural Cyst Associated with Baastrup Disease
• Posterior Epidural Migration of Sequestrated Disc
• Posterior Fossa Pilocytic Astrocytoma without Gangliocytic Differentiation
• Posterior Quadrantic Dysplasia
• Posterior Reversible Encephalopathy Syndrome
• Posterior Reversible Encephalopathy Syndrome (PRES)
• Posterior Spinal Artery Syndrome Following Thrombotic Occlusion of the Vertebral Artery
• Postictal Signal Changes
• Postpartum Hypernatremic Osmotic Demyelination
• Posttraumatic CSF Oculorrhea Secondary to Cranio-Orbital Fistula
• Posttraumatic Sialocele of the Submandibular Gland
• Pott's Puffy Tumor
• Prevertebral (Longus Coli) Calcific Tendinitis
• Primary bilateral parotid Non-Hodgkin lymphoma (MALT Type)
• Primary CNS Lymphoma (PCNSL) in an Immunocompetent Patient
• Primary CNS T Cell Lymphoma (Lymphomatosis Cerebri Pattern)
• Primary Extradural Meningioma
• Primary Extradural Meningioma
• Primary Extradural Meningioma
• Primary Familial Brain Calcification
• Primary Intraosseous Meningioma
• Primary Lateral Sclerosis (PLS) with adaptive compensatory functional changes
• Primary Leptomeningeal Lymphoma
• Primary Melanoma of Cerebellopontine Angle
• Primary Nasopharyngeal Non-Hodgkin Lymphoma
• Primary Pachymeningeal (Dural) CNS Lymphoma
• Primary Paranasal Sinus Diffuse Large B-cell Non-Hodgkin Lymphoma
• Progressive Multifocal Leukoencephalopathy
• Progressive Multifocal Leukoencephalopathy
• Progressive Multifocal Leukoencephalopathy
• Progressive Supranuclear Palsy
• Psammomatoid Ossifying Fibroma
• Psammomatous Meningioma
• Pseudohypoparathyroidism
• Pseudo-Subarachnoid Hemorrhage
• Pseudotumor Hemicerebellitis
• Pterygoid Hamulus Syndrome
• Pyogenic Brain Abscess