Bone marrow trephine biopsy was available in 84 cases; 3 types of growth patterns were noted: interstitial, nodular and packed with nodular pattern
constituting maximum number of cases (Table 2] (Figure 2].
11,12) The nodular pattern
of growth, presence of collagenous stroma between the nodules, and presence of three distinct types of vessels according to immunostaining can differentiate it from other splenic vascular tumors.
The patterns of peritoneal involvement were identified as smudged pattern (increased density or soft tissue permeation of the omental fat), nodular pattern
(enhancing soft tissue nodules), omental caking (diffusely thickened masses replacing normal omental fat), cystic pattern (soft tissue masses with cystic component) and mixed pattern (having two or more of above described patterns).
The nodular pattern
is far more common and is characterized by partially preserved or effaced lymph node architecture by an atypical lymphoid proliferation in a nodular pattern
(Figure 7, A).
It has various morphological patterns--nodular, vesicular, pustular, bullous and necrotic--with the nodular pattern
being the most common.
MR T1-weighted imaging shows inhomogenous lesions with low signal intensity; whereas on T2 weighted MR imaging, the lesion appears with a diffuse nodular pattern
with areas of high intensity associated with signal low intensity or signal voids.
The various patterns that we could retrospectively identify on ultrasound were the nodular pattern
Multiple skin lesions of nodular pattern
with violaceous color might suggest an underlying myeloid neoplasm.
But no statistical differences were seen between two groups as regards the frequency or location of parenchymal infiltration, pleural effusion or nodular pattern
Microscopically, sections revealed neoplastic growth displayed in vaguely nodular pattern
with intersecting thick fibrous septea.
8-11 Serial radiographs may show progression from a nodular pattern
to confluent consolidation, as seen in this patient (Figures 2,3).
Silicosis is frequently found together with old fibrotic PTB, in which case the nodular pattern
is typically disturbed by unilateral fibrosis and contraction of one of the upper lobes (Fig.